* [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works)
@ 2018-03-27 10:38 Michael Fladischer
2018-03-28 8:27 ` Zdenek Kabelac
0 siblings, 1 reply; 4+ messages in thread
From: Michael Fladischer @ 2018-03-27 10:38 UTC (permalink / raw)
To: linux-lvm
Hi,
I'm unable to create PVs on Multipath-Volumes that are available at
/dev/dm-NN where N~[0-9] but I can create them on single digit devices
like /dev/dm-9:
# pvcreate /dev/dm-6
Physical volume "/dev/dm-6" successfully created.
# pvcreate /dev/dm-16
Device /dev/dm-16 not found (or ignored by filtering).
My Version of LVM is 2.02.168 from Debian 9.
The filter ist set to a permissive value:
filter = [ "a|.*|" ]
global_filter = [ "a|.*|" ]
Any ideas why two or more digits in the device path can cause it to be
filtered by pvcreate?
Cheers,
--
Michael Fladischer
Fladi.at
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works)
2018-03-27 10:38 [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works) Michael Fladischer
@ 2018-03-28 8:27 ` Zdenek Kabelac
2018-03-28 8:59 ` Michael Fladischer
2018-03-28 10:08 ` Roger Heflin
0 siblings, 2 replies; 4+ messages in thread
From: Zdenek Kabelac @ 2018-03-28 8:27 UTC (permalink / raw)
To: LVM general discussion and development, Michael Fladischer
Dne 27.3.2018 v 12:38 Michael Fladischer napsal(a):
> Hi,
>
> I'm unable to create PVs on Multipath-Volumes that are available at
> /dev/dm-NN where N~[0-9] but I can create them on single digit devices
> like /dev/dm-9:
>
> # pvcreate /dev/dm-6
> Physical volume "/dev/dm-6" successfully created.
>
> # pvcreate /dev/dm-16
> Device /dev/dm-16 not found (or ignored by filtering).
>
> My Version of LVM is 2.02.168 from Debian 9.
> The filter ist set to a permissive value:
> filter = [ "a|.*|" ]
> global_filter = [ "a|.*|" ]
>
> Any ideas why two or more digits in the device path can cause it to be
> filtered by pvcreate?
>
Hi
lvm2 is detecting multipath 'component' devices - those are not allowed to be
used for pvcreate.
You can use 'pvcreate -vvv' to get more information - there will be printed
the reason why devices are rejected....
Eventually if you can't figure this out yourself - provide this trace in
attachment.
Regards
Zdenek
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works)
2018-03-28 8:27 ` Zdenek Kabelac
@ 2018-03-28 8:59 ` Michael Fladischer
2018-03-28 10:08 ` Roger Heflin
1 sibling, 0 replies; 4+ messages in thread
From: Michael Fladischer @ 2018-03-28 8:59 UTC (permalink / raw)
To: LVM general discussion and development
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On Wed, 2018-03-28 at 10:27 +0200, Zdenek Kabelac wrote:
> lvm2 is detecting multipath 'component' devices - those are not
> allowed to be
> used for pvcreate.
>
> You can use 'pvcreate -vvv' to get more information - there will be
> printed
> the reason why devices are rejected....
Thanks, I figured it out. As it happens those devices with two digits
had a GPT on them. Once I erased the primary copy at the beginning of
the devices, I was able to use pvcreate on them.
Cheers,
--
Michael Fladischer
Fladi.at
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works)
2018-03-28 8:27 ` Zdenek Kabelac
2018-03-28 8:59 ` Michael Fladischer
@ 2018-03-28 10:08 ` Roger Heflin
1 sibling, 0 replies; 4+ messages in thread
From: Roger Heflin @ 2018-03-28 10:08 UTC (permalink / raw)
To: LVM general discussion and development; +Cc: Michael Fladischer
I suggest you should never directly be touching the /dev/dm* devices
via that name.
Always touch the actual named device (/dev/mpath, /dev/vgname/lv A
given dm device can be a number of other devices (lv,s, mpath, mpath
components, encrypted device, md raid, and probably some others).
From just the dm* name you really don't know which kind of device it
is, and there is a lot of risk of confusion and/or data loss.
I have debugged situations were someone went in and partitioned all of
their /dev/dm* devices and some of those devices were actually the
LV's and others were they created PV's on other LV's. Without a few
commands you cannot easily know what the dm* device is, so access it
via the more sensibly named device.
On Wed, Mar 28, 2018 at 3:27 AM, Zdenek Kabelac <zkabelac@redhat.com> wrote:
> Dne 27.3.2018 v 12:38 Michael Fladischer napsal(a):
>>
>> Hi,
>>
>> I'm unable to create PVs on Multipath-Volumes that are available at
>> /dev/dm-NN where N~[0-9] but I can create them on single digit devices
>> like /dev/dm-9:
>>
>> # pvcreate /dev/dm-6
>> Physical volume "/dev/dm-6" successfully created.
>>
>> # pvcreate /dev/dm-16
>> Device /dev/dm-16 not found (or ignored by filtering).
>>
>> My Version of LVM is 2.02.168 from Debian 9.
>> The filter ist set to a permissive value:
>> filter = [ "a|.*|" ]
>> global_filter = [ "a|.*|" ]
>>
>> Any ideas why two or more digits in the device path can cause it to be
>> filtered by pvcreate?
>>
>
>
>
> Hi
>
>
> lvm2 is detecting multipath 'component' devices - those are not allowed to
> be used for pvcreate.
>
> You can use 'pvcreate -vvv' to get more information - there will be printed
> the reason why devices are rejected....
>
> Eventually if you can't figure this out yourself - provide this trace in
> attachment.
>
>
> Regards
>
> Zdenek
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-03-27 10:38 [linux-lvm] Cannot create PV on /dev/dm-NN (/dev/dm-N works) Michael Fladischer
2018-03-28 8:27 ` Zdenek Kabelac
2018-03-28 8:59 ` Michael Fladischer
2018-03-28 10:08 ` Roger Heflin
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