disable raid autodetect at boot

disable raid autodetect at boot

[Alexander Lyakas]

Hello,

I have a simple raid1 created on top of /dev/sda and /dev/sdb. After I
reboot, I would like to always manually assemble the raid. However,
every time the machine reboots, it looks like md tries to
automatically reassemble the raid, but usually binds only one of the
source devices:

16936	May 23 11:47:36 vc kernel: [    3.472926] md: linear personality
registered for level -1
16937	May 23 11:47:36 vc kernel: [    3.509352] md: multipath
personality registered for level -4
16938	May 23 11:47:36 vc kernel: [    3.551948] md: raid0 personality
registered for level 0
16939	May 23 11:47:36 vc kernel: [    3.683874] md: raid1 personality
registered for level 1
16953	May 23 11:47:36 vc kernel: [    4.944362] md: raid6 personality
registered for level 6
16954	May 23 11:47:36 vc kernel: [    4.944364] md: raid5 personality
registered for level 5
16955	May 23 11:47:36 vc kernel: [    4.944365] md: raid4 personality
registered for level 4
16956	May 23 11:47:36 vc kernel: [    4.949193] md: raid10 personality
registered for level 10
16971	May 23 11:47:36 vc kernel: [    6.059194] md: bind<sdb>

And /proc/mdstat has:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md_d127 : inactive sdd[1](S)
      2097140 blocks super 1.2

According to md.txt, "only drives with a type 0 superblock can be
autodetected and run at boot time". During raid creation, I have
specified metadata version to be 1.2; this is confirmed by --examine.
Also, I have tried to use raid=noautodetect kernel parameter, but the
auto-detection still keeps happening.

The only way up to now I have found to prevent this, is by specifying
something like
DEVICE /dev/null
in /etc/mdadm/mdadm.conf

What am I missing?

Thanks,
  Alex.

Re: disable raid autodetect at boot

[Michael Tokarev]

23.05.2011 13:36, Alexander Lyakas wrote:
> Hello,
> 
> I have a simple raid1 created on top of /dev/sda and /dev/sdb. After I
> reboot, I would like to always manually assemble the raid. However,
> every time the machine reboots, it looks like md tries to
> automatically reassemble the raid, but usually binds only one of the
> source devices:
> 
> 16936	May 23 11:47:36 vc kernel: [    3.472926] md: linear personality
> registered for level -1
..
> 16971	May 23 11:47:36 vc kernel: [    6.059194] md: bind<sdb>

This is not kernel autodetection, this is your initramfs/initrd
and mdadm.  Or maybe mdadm in the regular root filesystem.

/mjt

Re: disable raid autodetect at boot

[Alexander Lyakas]

Michael,
can you pls explain what do I need to look at to disable this.

Alex.


On Mon, May 23, 2011 at 1:35 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
> 23.05.2011 13:36, Alexander Lyakas wrote:
>> Hello,
>>
>> I have a simple raid1 created on top of /dev/sda and /dev/sdb. After I
>> reboot, I would like to always manually assemble the raid. However,
>> every time the machine reboots, it looks like md tries to
>> automatically reassemble the raid, but usually binds only one of the
>> source devices:
>>
>> 16936 May 23 11:47:36 vc kernel: [    3.472926] md: linear personality
>> registered for level -1
> ..
>> 16971 May 23 11:47:36 vc kernel: [    6.059194] md: bind<sdb>
>
> This is not kernel autodetection, this is your initramfs/initrd
> and mdadm.  Or maybe mdadm in the regular root filesystem.
>
> /mjt
>
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Re: disable raid autodetect at boot

[Michael Tokarev]

23.05.2011 16:50, Alexander Lyakas wrote:
> Michael,
> can you pls explain what do I need to look at to disable this.

> On Mon, May 23, 2011 at 1:35 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:

>> This is not kernel autodetection, this is your initramfs/initrd
>> and mdadm.  Or maybe mdadm in the regular root filesystem.

You need to find out where and how mdadm is called
on your system during bootup, and fix that place.

/mjt

Re: disable raid autodetect at boot

[Alexander Lyakas]

Michael,
thank you for your advice.

The only place where I saw mdadm is being called on boot is via
/etc/init.d/mdadm, which starts mdadm with --monitor --scan options.
Still I disabled the daemon start (in /etc/default/mdadm), but
inactive raid keeps reappearing on boot.

How can I find out who else might be calling mdadm on boot?

Thanks,
   Alex.


On Mon, May 23, 2011 at 4:21 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
> 23.05.2011 16:50, Alexander Lyakas wrote:
>> Michael,
>> can you pls explain what do I need to look at to disable this.
>
>> On Mon, May 23, 2011 at 1:35 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
>
>>> This is not kernel autodetection, this is your initramfs/initrd
>>> and mdadm.  Or maybe mdadm in the regular root filesystem.
>
> You need to find out where and how mdadm is called
> on your system during bootup, and fix that place.
>
> /mjt
>
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Re: disable raid autodetect at boot

[Nikolay Kichukov]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,
you should most likely disable the assembly of the arrays in the initramfs pre/post startup subsystem scripts.

I have it configured such as when initramfs image is loaded it automagically detects all my raid drives, various
versions: 0.9 and 1.2.

For example:

$ gunzip < /boot/initrd.img-2.6.32-5-vserver-amd64 | cpio -i --make-directories
62745 blocks
$ ls
bin  conf  etc  init  lib  lib64  sbin  scripts


You can take it from here...

Cheers,
- -Nik

On 05/25/2011 06:15 PM, Alexander Lyakas wrote:
> Michael,
> thank you for your advice.
> 
> The only place where I saw mdadm is being called on boot is via
> /etc/init.d/mdadm, which starts mdadm with --monitor --scan options.
> Still I disabled the daemon start (in /etc/default/mdadm), but
> inactive raid keeps reappearing on boot.
> 
> How can I find out who else might be calling mdadm on boot?
> 
> Thanks,
>    Alex.
> 
> 
> On Mon, May 23, 2011 at 4:21 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
>> 23.05.2011 16:50, Alexander Lyakas wrote:
>>> Michael,
>>> can you pls explain what do I need to look at to disable this.
>>
>>> On Mon, May 23, 2011 at 1:35 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
>>
>>>> This is not kernel autodetection, this is your initramfs/initrd
>>>> and mdadm.  Or maybe mdadm in the regular root filesystem.
>>
>> You need to find out where and how mdadm is called
>> on your system during bootup, and fix that place.
>>
>> /mjt
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
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