Re: [linux-lvm] RAID and LVM?

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Mon, 26 Jul 1999, David Venus wrote:
  
  Hi!
  
  I am guessing the difference is that one accesses the
  drive/device in block mode (bh_dev) and the other as a
  character/raw device (bh_rdev).

i'm not much of a kernel hacker, but i think b_dev/r_dev is
device/real device... ie md0/sda3 type of thing. but i'm not sure.

what i'd like to know is: if i'm right, why does lvm want to make
bh->b_dev=bh->b_rdev?? .. i don't know. it means if lvm tries to read
from mdx, then the md code is invoked with hd<something> instead of
md.. which fails miserably of course...

i left this hack out, and the kernel booted. RAID worked, LVM worked
on normal devices.. but the LVM tools gave errors when i tried to
build VLM ontop of a RAID device (ingo's latest raid that is).
  
The reason for the device remap is something to do with the original
md code, but i don't know why. Ingo's new RAID code should be pretty
transparent and hence LVM shouldn't need to do low-level fiddling
around in ll_rw_blk. an mdx device is afaik pretty much the same as
an hdax device.. (right?)

regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
Now and then an innocent man is sent to the legislature.

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Mon, 2 Aug 1999, James Pattinson wrote:

  Cheers - I'll try that later on.
  
  Does anyone have a such thing as a patch against 2.2.10 which includes LVM
  and RAID0145? It's just I feel a lot happier running 2.2.10, rather than

i have 2.2.11pre4, with raid0145-19990724, lvm and devfs (plus some
more stuff aswell). Both raid and lvm work, but not on top of each
other, at least not for raid5 anyway. (luca has reported success with
lvm on raid1 or raid0 i believe).

if you want i'll do a diff against plain 2.2.11pre4 if you want.

  PS - I tried devfs on -ac12 last week as well, impressive, but I couldn't
  seem to use my SCSI cdrom drive anymore, no such thing as /dev/scd or even
  /dev/*cd* exists! Also, I had to `modprobe loop` before I could access
  /dev/loop*.
  
that's cause it'd be under /dev/sr/ now. :) incidentally are you sure
you had a /dev/scd?? scsi cdrom's are usually /dev/sr<something>.
ATAPI cdrom's would appear under ide/cd/.

regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
There are only two things in this world that I am sure of, death and
taxes, and we just might do something about death one of these days.
		-- shades

Re: [linux-lvm] RAID and LVM?

[S. Ryan Quick]

-----BEGIN PGP SIGNED MESSAGE-----

I am running 2.2.10 w/ LVM 0.7 and raid linear/0/1/4-5 -- I can send along source or a Debian kernel package (sorry, no RH for me)...

On Mon, 2 Aug 1999, James Pattinson wrote:

> Cheers - I'll try that later on.
> 
> Does anyone have a such thing as a patch against 2.2.10 which includes LVM
> and RAID0145? It's just I feel a lot happier running 2.2.10, rather than
> -ac12 - as it breaks a few things on my notebook. And yes - I do run lvm
> and raid regularly on this, as well and informix dynamic server.
> /dev/loop* is my friend!
> 
> James
> 
> PS - I tried devfs on -ac12 last week as well, impressive, but I couldn't
> seem to use my SCSI cdrom drive anymore, no such thing as /dev/scd or even
> /dev/*cd* exists! Also, I had to `modprobe loop` before I could access
> /dev/loop*.
> 
> On Mon, 2 Aug 1999, Luca Berra wrote:
> 
> > On Mon, Aug 02, 1999 at 09:57:24AM +0100, James Pattinson wrote:
> > > Is anyone using alan's ac12 patch for RAID and LVM? My machine at home has
> > > 2.2.10 with raid0145 applied, and my root partition is striped across two
> > > hd/s controllers. I want to be able to use LVM though.
> > i did test it, it seems working, unluckyly ac12 breaks isdn, so i cannot use
> > it much on my main machine :(
> > 
> > > I downloaded alan's patch, but then couldn't get LVM tools to compile at
> > > all. Do I need to upgrade to a new glibc or something? I'm running more or
> > > less a basic RH6 system.
> > 
> > you need this patch to build raidtools:
> > http://www.comedia.it/bluca/lvm/lvm-0.7.glibc.patch
> > (also attached here)
> > if you need i can also provide a spec file
> > or source RPM
> > 
> > 
> > -- 
> > Luca Berra -- bluca@comedia.it
> >     Communications Media & Services S.r.l.
> > 
> 
> 
> 

%                                                       %%%%%%%%%%
%%           S. Ryan Quick                               %%%%%%%%%
%%%           UNIX Systems Engineer                       %%%%%%%%
%%%%           Phaedo Consulting, Inc. -- Exec VP          %%%%%%%
%%%%%                                                       %%%%%%
%%%%%%         www.phaedo.com/ryan/  ryan@phaedo.com         %%%%%
%%%%%%%       ------------ PGP FingerPrint -------------      %%%%
%%%%%%%%  CF 19 6B BA 31 8E B8 8E  20 DF 4F 2B 2E 69 81 F5     %%%
%%%%%%%%%     ------------------------------------------        %%
%%%%%%%%%%                                                       %

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Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Mon, Aug 02, 1999 at 02:25:09PM +0100, James Pattinson wrote:
> PS - I tried devfs on -ac12 last week as well, impressive, but I couldn't
> seem to use my SCSI cdrom drive anymore, no such thing as /dev/scd or even
> /dev/*cd* exists! Also, I had to `modprobe loop` before I could access
> /dev/loop*.
look for /dev/sr/ :)))
also the devfs patch adds a devfs directory
under linux/Documentation/filesystems
chech the files in there for a suggested
/etc/conf.modules configuration

L.

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[James Pattinson]

Cheers - I'll try that later on.

Does anyone have a such thing as a patch against 2.2.10 which includes LVM
and RAID0145? It's just I feel a lot happier running 2.2.10, rather than
-ac12 - as it breaks a few things on my notebook. And yes - I do run lvm
and raid regularly on this, as well and informix dynamic server.
/dev/loop* is my friend!

James

PS - I tried devfs on -ac12 last week as well, impressive, but I couldn't
seem to use my SCSI cdrom drive anymore, no such thing as /dev/scd or even
/dev/*cd* exists! Also, I had to `modprobe loop` before I could access
/dev/loop*.

On Mon, 2 Aug 1999, Luca Berra wrote:

> On Mon, Aug 02, 1999 at 09:57:24AM +0100, James Pattinson wrote:
> > Is anyone using alan's ac12 patch for RAID and LVM? My machine at home has
> > 2.2.10 with raid0145 applied, and my root partition is striped across two
> > hd/s controllers. I want to be able to use LVM though.
> i did test it, it seems working, unluckyly ac12 breaks isdn, so i cannot use
> it much on my main machine :(
> 
> > I downloaded alan's patch, but then couldn't get LVM tools to compile at
> > all. Do I need to upgrade to a new glibc or something? I'm running more or
> > less a basic RH6 system.
> 
> you need this patch to build raidtools:
> http://www.comedia.it/bluca/lvm/lvm-0.7.glibc.patch
> (also attached here)
> if you need i can also provide a spec file
> or source RPM
> 
> 
> -- 
> Luca Berra -- bluca@comedia.it
>     Communications Media & Services S.r.l.
> 

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

[-- Attachment #1: Type: text/plain, Size: 813 bytes --]

On Mon, Aug 02, 1999 at 09:57:24AM +0100, James Pattinson wrote:
> Is anyone using alan's ac12 patch for RAID and LVM? My machine at home has
> 2.2.10 with raid0145 applied, and my root partition is striped across two
> hd/s controllers. I want to be able to use LVM though.
i did test it, it seems working, unluckyly ac12 breaks isdn, so i cannot use
it much on my main machine :(

> I downloaded alan's patch, but then couldn't get LVM tools to compile at
> all. Do I need to upgrade to a new glibc or something? I'm running more or
> less a basic RH6 system.

you need this patch to build raidtools:
http://www.comedia.it/bluca/lvm/lvm-0.7.glibc.patch
(also attached here)
if you need i can also provide a spec file
or source RPM


-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

[-- Attachment #2: lvm-0.7.glibc.patch --]
[-- Type: text/plain, Size: 1667 bytes --]

--- 0.7/tools/lib/liblvm.h.glibc.orig	Mon Jul 12 23:21:26 1999
+++ 0.7/tools/lib/liblvm.h	Sun Jul 25 21:15:11 1999
@@ -80,6 +80,25 @@
 #  include <time.h>
 int llseek ( unsigned int, unsigned long long, unsigned int);
 
+/* from genhd.h */
+#define DOS_EXTENDED_PARTITION 5
+#define LINUX_EXTENDED_PARTITION 0x85
+#define WIN98_EXTENDED_PARTITION 0x0f
+#define LINUX_SWAP_PARTITION	0x82
+
+struct partition {
+	unsigned char boot_ind;		/* 0x80 - active */
+	unsigned char head;		/* starting head */
+	unsigned char sector;		/* starting sector */
+	unsigned char cyl;		/* starting cylinder */
+	unsigned char sys_ind;		/* What partition type */
+	unsigned char end_head;		/* end head */
+	unsigned char end_sector;	/* end sector */
+	unsigned char end_cyl;		/* end cylinder */
+	unsigned int start_sect;	/* starting sector counting from 0 */
+	unsigned int nr_sects;		/* nr of sectors in partition */
+} __attribute__((packed));
+
 #else /* __GLIBC__ < 2 */
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION ( 2, 1, 0)
@@ -96,11 +115,11 @@
 #  include <linux/msdos_fs.h>
 #  include <malloc.h>
 #  include <stdio.h>
+#  include <linux/genhd.h>
 #endif /* __GLIBC__ > 1 */
 
 #include <linux/lvm.h>
 #include <sys/ioctl.h>
-#include <linux/genhd.h>
 #include <linux/major.h>
 
 #define	LVM_LIB_IOP_VERSION	4
--- 0.7/tools/lvm_user.h.glibc.orig	Mon Jul 12 23:21:27 1999
+++ 0.7/tools/lvm_user.h	Sun Jul 25 21:17:54 1999
@@ -42,7 +42,6 @@
 #include <features.h>
 #include <liblvm.h>
 
-#include <linux/genhd.h>
 #include <linux/major.h>
 
 #if ( __GLIBC__ > 1)
@@ -57,6 +56,7 @@
 
 #else
 
+#include <linux/genhd.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <malloc.h>

Re: [linux-lvm] RAID and LVM?

[James Pattinson]

Is anyone using alan's ac12 patch for RAID and LVM? My machine at home has
2.2.10 with raid0145 applied, and my root partition is striped across two
hd/s controllers. I want to be able to use LVM though.

I downloaded alan's patch, but then couldn't get LVM tools to compile at
all. Do I need to upgrade to a new glibc or something? I'm running more or
less a basic RH6 system.

Any tips?

Cheers!

James

>   new way!
>   you better check alans patch it is on kernel.org mirrors
> 
> great... alan must have exercised his magic coding fingers and
> massaged the two patches into their proper places :)  
> 
>   we have to set the partition as a raid autodetect partition
>   then create an initrd with the command
>   insmod lvm.o
>   vgscan
>   vgchange -a y
>   
> uhmm.. but i think eventually for LVM on RAID autodetect to work
> nicely, LVM is going to have to use some block device contents magic.
> 
> or ideally for raid to be fully integrated into LVM, and create
> RAID-5 VG's. 
> 
>   the problem is that when raid is loaded as a module autodetect
>   does not happen than when initrd is finished :(
>   
>   L.
>   
>   
> i'm downloading your patch now anyway. 
> 
> regards,
> -- 
> Paul Jakma
> paul@clubi.ie	http://hibernia.clubi.ie
> PGP5 key: http://www.clubi.ie/jakma/publickey.txt
> -------------------------------------------
> Fortune:
> A meeting is an event at which the minutes are kept and the hours are lost.
> 
> 
> 

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Tue, Jul 27, 1999 at 11:47:37AM +0200, Luca Berra wrote:
> On Mon, Jul 26, 1999 at 10:25:50PM +0200, Ingo Molnar wrote:
> > > or ideally for raid to be fully integrated into LVM, and create
> > > RAID-5 VG's. 
> > or, considering the relative complexity of the two drivers (and the
> > conceptual background), to integrate LVM into the concepts of RAID :) Or
> i dont understand your last sentence
> > let them live side by side as now.
> 
> i believe useful integrating raid and lvm
> it means a user can dcide the different raid policy
> for each type of data.
Following a recent discussion on linux-raid, it occurs to me
that another reason for integrating raid into lvm would be
ease of adding disks to an existing setup.

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Heinz Mauelshagen]

> 
> On Tue, Jul 27, 1999 at 02:23:53PM +0000, Heinz Mauelshagen wrote:
> > > i believe useful integrating raid and lvm
> > > it means a user can dcide the different raid policy
> ...
> > That's the Veritas Volume Manager concept.
> that is what i am accustomed to.
> i usually work on hp servers.
> are you suggesting there are better ways to do things?

Only different ways 8*)

I like HPs ease of use and concept. It avoids lots of work to
learn LVM administration and to use it in day by day business.
That's the reason why the Linux LVM is similar to HPs.

> 
> > > as a side question, how does LVM autodetect works
> > > (if it exists, that is)?
> 
> > Today, it's the initrd mechanism (partially) supported by lvmcreate_initrd
> > in LVM 0.7.
> that is what i tought, see my previous msg
> but the scan is done in user space, i was asking if some
> kernel space solution existed/was planned/has any sense

If we want to get rid of the initrd constraints there must be a driver
init time solution in the LVM, which is able to autodetect a 'boot' VG 
or at least a LILO parameter telling the LVM driver, which VG to use for boot.

This means on the other hand, that the driver code will be bigger
and therefore more complex than it is today. It's no kernel size issue,
because the code can be thrown away after init.

> 
> what i want to do is have both raid and LVM work and be autodetected
> at boot even if both are compiled as modules.
> why would i want to do this?
> Distributions, i would like both raid and lvm to become
> a standard part of all linux distributions.

I like your opinion ;*)

> 
> i hope that there will be some improvements in
> boot loaders, so we can avoid the small bios addressable
> partition, and completely avoid the idiotic pc partitioning
> cheme.
>

This means LILO^2.

But if you don't keep up with partitions/slices or whatever, you
you should have a kind of header anyway, which carries basic identifying
information about the disks contents/usage.
The information presented by disk firmware today is not sufficient
to avoid accidential misuse of the disk contents.

IMO it's not a big issue to have a small (~8-16m) bios addressable
partition (which could be MD mirrored) to store the kernel and some
neccessary stuff to fire the machine up including MD and LVM.

Regards,
Heinz

--

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Systemmanagement CS-TS                           T-Nova
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
Senior Systems Engineer                          Postfach 10 05 41
                                                 64205 Darmstadt
mge@ez-darmstadt.telekom.de                      Germany
                                                 +49 6151 886-425
                                                          FAX-386
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Tue, Jul 27, 1999 at 02:23:53PM +0000, Heinz Mauelshagen wrote:
> > i believe useful integrating raid and lvm
> > it means a user can dcide the different raid policy
...
> That's the Veritas Volume Manager concept.
that is what i am accustomed to.
i usually work on hp servers.
are you suggesting there are better ways to do things?

> > as a side question, how does LVM autodetect works
> > (if it exists, that is)?

> Today, it's the initrd mechanism (partially) supported by lvmcreate_initrd
> in LVM 0.7.
that is what i tought, see my previous msg
but the scan is done in user space, i was asking if some
kernel space solution existed/was planned/has any sense

what i want to do is have both raid and LVM work and be autodetected
at boot even if both are compiled as modules.
why would i want to do this?
Distributions, i would like both raid and lvm to become
a standard part of all linux distributions.

i hope that there will be some improvements in
boot loaders, so we can avoid the small bios addressable
partition, and completely avoid the idiotic pc partitioning
cheme.

Regards,
Luca

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Heinz Mauelshagen]

> 
> On Mon, Jul 26, 1999 at 10:25:50PM +0200, Ingo Molnar wrote:
> > (rather flame me for it ;) The new RAID driver will likely not go into
> > 2.2.11, but into 2.2.12. Anyway, the new RAID 0723 release is much more
> > merging-friendly wrt. LVM.
> 
> ok, you asked for it ;)
> there is still some idiosyncrasye wrt HSM and it doesn't build.
> *joking*
> 2.2.11 or 2.2.12 does not seem to be a big problem to me.
> 
> > > or ideally for raid to be fully integrated into LVM, and create
> > > RAID-5 VG's. 
> > or, considering the relative complexity of the two drivers (and the
> > conceptual background), to integrate LVM into the concepts of RAID :) Or
> i dont understand your last sentence
> > let them live side by side as now.
> 
> i believe useful integrating raid and lvm
> it means a user can dcide the different raid policy
> for each type of data.
> eg. striping for /var/spool/junk
> 3 way raid1 for /very/important/stuff
> raid5 for /other/data

That's the Veritas Volume Manager concept.

> 
> Leaving things as now is still very useful, and i will be very 
> happy to have this arrangement finalized.
> we really need to fix LILO (or another boot loader, grub already
> can read ext2 filesystems) to be able to understand raid and lvm.
> 
> as a side question, how does LVM autodetect works
> (if it exists, that is)?
> 

Today, it's the initrd mechanism (partially) supported by lvmcreate_initrd
in LVM 0.7.
Basically the idea is to have a bios addressable partition (8MB is sufficient)
with initrd, vmlinuz, linuxrc, sbin/vgchange, sbin/vgscan, ... and to switch
to the real root after activating the root volume group in linuxrc.
All the rest can be under lvm control.

Basically the lvm driver can take care of reading the VGDA from the
root VG disks at init time.

Regards,
Heinz
--

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Systemmanagement CS-TS                           T-Nova
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
Senior Systems Engineer                          Postfach 10 05 41
                                                 64205 Darmstadt
mge@ez-darmstadt.telekom.de                      Germany
                                                 +49 6151 886-425
                                                          FAX-386
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Mon, Jul 26, 1999 at 10:25:50PM +0200, Ingo Molnar wrote:
> (rather flame me for it ;) The new RAID driver will likely not go into
> 2.2.11, but into 2.2.12. Anyway, the new RAID 0723 release is much more
> merging-friendly wrt. LVM.

ok, you asked for it ;)
there is still some idiosyncrasye wrt HSM and it doesn't build.
*joking*
2.2.11 or 2.2.12 does not seem to be a big problem to me.

> > or ideally for raid to be fully integrated into LVM, and create
> > RAID-5 VG's. 
> or, considering the relative complexity of the two drivers (and the
> conceptual background), to integrate LVM into the concepts of RAID :) Or
i dont understand your last sentence
> let them live side by side as now.

i believe useful integrating raid and lvm
it means a user can dcide the different raid policy
for each type of data.
eg. striping for /var/spool/junk
3 way raid1 for /very/important/stuff
raid5 for /other/data

Leaving things as now is still very useful, and i will be very 
happy to have this arrangement finalized.
we really need to fix LILO (or another boot loader, grub already
can read ext2 filesystems) to be able to understand raid and lvm.

as a side question, how does LVM autodetect works
(if it exists, that is)?

Regards
Luca

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Mon, 26 Jul 1999, Ingo Molnar wrote:

  
  On Mon, 26 Jul 1999, Paul Jakma wrote:
  
  (rather flame me for it ;) 

ah.. oops.. sorry. How does "Ingo's magic coding fingers" sound? :)

  The new RAID driver will likely not go into
  2.2.11, but into 2.2.12. Anyway, the new RAID 0723 release is much more
  merging-friendly wrt. LVM.

great... by the way would you have any advice about the bh->b_dev,
bh->b_rdev thing. I'm not much of a hacker, but am keen to test. 
  

  > or ideally for raid to be fully integrated into LVM, and create
  > RAID-5 VG's. 
  
  or, considering the relative complexity of the two drivers (and the
  conceptual background), to integrate LVM into the concepts of RAID :) Or
  let them live side by side as now.

lvm into raid sounds good too. imho, layering one on top of the other
isn't optimal. Only integration of the two can be. (whichever way
isn't really important).
  
  -- mingo
  
regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
There is no time like the present for postponing what you ought to be doing.

Re: [linux-lvm] RAID and LVM?

[Ingo Molnar]

On Mon, 26 Jul 1999, Paul Jakma wrote:

>   new way!
>  you better check alans patch it is on kernel.org mirrors
>
> great... alan must have exercised his magic coding fingers and
> massaged the two patches into their proper places :)

(rather flame me for it ;) The new RAID driver will likely not go into
2.2.11, but into 2.2.12. Anyway, the new RAID 0723 release is much more
merging-friendly wrt. LVM.

>   we have to set the partition as a raid autodetect partition
>   then create an initrd with the command
>   insmod lvm.o
>   vgscan
>   vgchange -a y
>   
> uhmm.. but i think eventually for LVM on RAID autodetect to work
> nicely, LVM is going to have to use some block device contents magic.
> 
> or ideally for raid to be fully integrated into LVM, and create
> RAID-5 VG's. 

or, considering the relative complexity of the two drivers (and the
conceptual background), to integrate LVM into the concepts of RAID :) Or
let them live side by side as now.

-- mingo

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Mon, 26 Jul 1999, Luca Berra wrote:


  new way!
  you better check alans patch it is on kernel.org mirrors

great... alan must have exercised his magic coding fingers and
massaged the two patches into their proper places :)  

  we have to set the partition as a raid autodetect partition
  then create an initrd with the command
  insmod lvm.o
  vgscan
  vgchange -a y
  
uhmm.. but i think eventually for LVM on RAID autodetect to work
nicely, LVM is going to have to use some block device contents magic.

or ideally for raid to be fully integrated into LVM, and create
RAID-5 VG's. 

  the problem is that when raid is loaded as a module autodetect
  does not happen than when initrd is finished :(
  
  L.
  
  
i'm downloading your patch now anyway. 

regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
A meeting is an event at which the minutes are kept and the hours are lost.

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Mon, Jul 26, 1999 at 01:12:17AM +0100, Paul Jakma wrote:
> cool! Tell me, how is md_make_request in md.c defined? The old way,
> or the new way:
> 
new way!
you better check alans patch it is on kernel.org mirrors

> i noticed lvm does autodetect based on partition ID. Raid does
> aswell. So how can we do autodetection for LVM on RAID? The md device
> won't have a partition id, and the underlying device will have to
> have a RAID partition ID for RAID to autodetect it. 
> Can LVM check for some magic within each block device and use that to
> decide whether a device is a PV or not?
we have to set the partition as a raid autodetect partition
then create an initrd with the command
insmod lvm.o
vgscan
vgchange -a y

the problem is that when raid is loaded as a module autodetect
does not happen than when initrd is finished :(

L.

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Mon, 26 Jul 1999, Luca Berra wrote:

  i checked alan cox's linux-2.2.10-ac12 pacth wich includes
  a heavily modified raid and lvm0.6 patch.
  i added my devfs patch 
  http://www.comedia.it/bluca/lvm/devfs-patch-v99.4-2.2.10-ac12.gz
  and i was able to create and use a vg on a raid 1 device

cool! Tell me, how is md_make_request in md.c defined? The old way,
or the new way:

int md_make_request (struct buffer_head * bh, int rw)
  
this is what's been causing me problems.

  todo: adding the diffs to the latest raid and lvm patches,
  		incremental diff for those can be found at
  		http://www.comedia.it/bluca/lvm/
  	checking autodetect, especially with both raid and
  		lvm loaded as modules. raid autorun happens before
  		and after initrd, now i need it during initrd.

i noticed lvm does autodetect based on partition ID. Raid does
aswell. So how can we do autodetection for LVM on RAID? The md device
won't have a partition id, and the underlying device will have to
have a RAID partition ID for RAID to autodetect it. 

Can LVM check for some magic within each block device and use that to
decide whether a device is a PV or not?
  
  Regards,
  Luca
  
regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
I cannot conceive that anybody will require multiplications at the rate
of 40,000 or even 4,000 per hour ...
		-- F. H. Wales (1936)

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Thu, Jul 22, 1999 at 09:48:45AM +0200, Luca Berra wrote:
> On Wed, Jul 21, 1999 at 10:22:57PM +0100, Paul Jakma wrote:
> > Anyway, back to the RAID+LVM saga.
...
> > So this has to be fixed soon anyway, and i'd love to be the guinea
> > pig. :)
> me too, i'll try something this weekend.
i love replying to myself :)))

i checked alan cox's linux-2.2.10-ac12 pacth wich includes
a heavily modified raid and lvm0.6 patch.
i added my devfs patch 
http://www.comedia.it/bluca/lvm/devfs-patch-v99.4-2.2.10-ac12.gz
and i was able to create and use a vg on a raid 1 device

todo: adding the diffs to the latest raid and lvm patches,
		incremental diff for those can be found at
		http://www.comedia.it/bluca/lvm/
	checking autodetect, especially with both raid and
		lvm loaded as modules. raid autorun happens before
		and after initrd, now i need it during initrd.

but appling those is time consuming and i have to take a plane to
Amsterdam in six hours time, so i'll better get some sleep :))))
I'll try that next week when i am back in Italy.

Regards,
Luca

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Wed, Jul 21, 1999 at 10:22:57PM +0100, Paul Jakma wrote:
> On Wed, 21 Jul 1999, Luca Berra wrote:
>   > raid0145-19990421-2.2.6 (which I've been using for quite a while),
>   which is a very BAD idea, (hasn't crashed yet? hope it doesn't)
>   UPGRADE your raid patches YESTERDAY
> 
> the bug you're reffering to won't crash your system, it just means
> that resyncs will never finish. 
i know, i meant that if your system crashes you'll have troubles

> i corrected the current->priority bug manually. 
you dinna say that! (so i switched into auto-warn mode)

> Anyway, back to the RAID+LVM saga.
i was in an hurry yesterday evening, anyway i'll do this kind of work
with the latest raid patches, they are more likely to be those that
end up in 2.2.x
> So this has to be fixed soon anyway, and i'd love to be the guinea
> pig. :)
me too, i'll try something this weekend.

L.

-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Wed, 21 Jul 1999, Luca Berra wrote:

  On Tue, Jul 20, 1999 at 10:40:02PM +0100, Paul Jakma wrote:
  > Ok..
  > 
  > I've got 2.2.11pre1, patched with Ingo Molnar's
  > raid0145-19990421-2.2.6 (which I've been using for quite a while),
  which is a very BAD idea, (hasn't crashed yet? hope it doesn't)
  UPGRADE your raid patches YESTERDAY

the bug you're reffering to won't crash your system, it just means
that resyncs will never finish. 

i corrected the current->priority bug manually. 

Anyway, back to the RAID+LVM saga.

OK, so i changed bh->b_dev to bh->b_rdev at the top of
md_make_request in md.c.

The resultant kernel didn't boot. It hung after detecting all my scsi
drives, damm.

Any ideas? Ingo's RAID patches are due to go in to 2.2.11 or 2.2.12.
So this has to be fixed soon anyway, and i'd love to be the guinea
pig. :)

regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
You should never wear your best trousers when you go out to fight for
freedom and liberty.
		-- Henrik Ibsen

Re: [linux-lvm] RAID and LVM?

[Luca Berra]

On Tue, Jul 20, 1999 at 10:40:02PM +0100, Paul Jakma wrote:
> Ok..
> 
> I've got 2.2.11pre1, patched with Ingo Molnar's
> raid0145-19990421-2.2.6 (which I've been using for quite a while),
which is a very BAD idea, (hasn't crashed yet? hope it doesn't)
UPGRADE your raid patches YESTERDAY

L.
-- 
Luca Berra -- bluca@comedia.it
    Communications Media & Services S.r.l.

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

Ok..

I've got 2.2.11pre1, patched with Ingo Molnar's
raid0145-19990421-2.2.6 (which I've been using for quite a while),
LVM 0.7 patch for 2.2.10 and devfs v99.4.

I applied the RAID0145 patch first, then LVM 0.7 2.2.10, finally
devfs. I had to hand apply a few LVM ll_rw_blk.c changes. Which was
fairly straight forward, except that md_make_request has changed for
RAID0145. it's now declared as:

int md_make_request (struct buffer_head * bh, int rw)

and part of the LVM patch to ll_rw_blk.c (round about line 713
of the old ll_rw_blk, line 751 in my ll_rw_blk.c) wants this:

md_make_request(MINOR (bh[i]->b_rdev), rw, bh[i]);

The new md_make_request doesn't have a device argument anymore, it
looks it up at the beginning of the md_make_request function in md.c
now. (but i don't know how important it all is, cause i don't know
the difference between a bh->b_dev and a bh->b_rdev). :)

I wasn't sure what to do so I left md_make_request in ll_rw_blk.c at: 

md_make_request( bh[i], rw);

Anyway... so then:

I have two RAID-5 devices, /dev/md/2 and /dev/md/3:

md3 : active raid5 sd/c0b0t3u0p6[2] sd/c0b0t2u0p6[1] sd/c0b0t1u0p6[0]
1050368 blocks level 5, 32k chunk, algorithm 0 [3/3] [UUU]
md2 : active raid5 sd/c0b0t3u0p5[2] sd/c0b0t2u0p5[1] sd/c0b0t1u0p5[0]
1050368 blocks level 5, 32k chunk, algorithm 0 [3/3] [UUU]

I have them initialised as PV's:

[root@hibernia tools]# pvcreate /dev/md/{2,3}
pvcreate -- reinitializing physical volume
pvcreate -- physical volume "/dev/md/2" successfully created
pvcreate -- reinitializing physical volume
pvcreate -- physical volume "/dev/md/3" successfully created

Now if try vgcreate:

[root@hibernia tools]# ./vgcreate test_vg /dev/md/{2,3}
vgcreate -- some invalid physical volumes in command line

So I'm stuck. Is this related to md_make_request using bh->b_dev
instead of bh->b_rdev? 

Should I add some #ifdef CONFIG_LVM: use bh->b_rdev to
md_make_request in md.c? Or should I revert md_make_request to a
accept
a MINOR number again?

thanks,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
\a\a\a\a	*** System shutdown message from root ***

System going down in 60 seconds

Re: [linux-lvm] RAID and LVM?

[Paul Jakma]

On Thu, 15 Jul 1999, Heinz Mauelshagen wrote:

  > 
  > I'm wondering: is it possible to run LVM on top of the linux-raid
  > patches?
  
  Yes, go ahead.
  LVM can run on MD.

That's great!! I've avoided moving totally over to RAID cause i knew
that at some point in the future i'll want to shuffle things around.
In which case I'd be better off using LVM.. And I'd heard somewhere
that the two patches couldn't play with each other.. So i decided to
wait before committing to either.

So this is excellent news. I have a project for next week!! :)

thanks,
  

  Regards,
  Heinz

regards,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
Got Mole problems?  Call Avogadro at 6.02 x 10^23.

Re: [linux-lvm] RAID and LVM?

[Heinz Mauelshagen]

> 
> I'm wondering: is it possible to run LVM on top of the linux-raid
> patches?

Yes, go ahead.
LVM can run on MD.

> 
> I'd like to carve up my disks into 500MB RAID-5 devices, and then
> build LVM on top of the /dev/md devices instead of the usual
> /dev/sd{a1,b1.. etc} devices.
> 
> Should I try it? or do the 2 patches tread on each others toes? (i
> notice they both touch buffer.c). 

No they don't.
lvm remaps in ll_rw_blk.c before md does.

> 
> if it can't be done, then are there any plans to integrate linux-raid
> and linux-lvm, or change LVM to able to use md devices?
> 
> (LVM and RAID are very complementary... really should be merged)
> 

Regards,
Heinz
--

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Systemmanagement CS/TS                           T-Nova
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
Senior Systems Engineer                          Postfach 10 05 41
                                                 64205 Darmstadt
mge@ez-darmstadt.telekom.de                      Germany
                                                 +49 6151 886-425
                                                          FAX-386
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

[linux-lvm] RAID and LVM?

[Paul Jakma]

I'm wondering: is it possible to run LVM on top of the linux-raid
patches?

I'd like to carve up my disks into 500MB RAID-5 devices, and then
build LVM on top of the /dev/md devices instead of the usual
/dev/sd{a1,b1.. etc} devices.

Should I try it? or do the 2 patches tread on each others toes? (i
notice they both touch buffer.c). 

if it can't be done, then are there any plans to integrate linux-raid
and linux-lvm, or change LVM to able to use md devices?

(LVM and RAID are very complementary... really should be merged)

thanks,
-- 
Paul Jakma
paul@clubi.ie	http://hibernia.clubi.ie
PGP5 key: http://www.clubi.ie/jakma/publickey.txt
-------------------------------------------
Fortune:
Don't get suckered in by the comments -- they can be terribly misleading.
Debug only code.
		-- Dave Storer