[DRBD-user] LVM PV on drbd block device

Juan Antonio pushakk at limbo.ari.es
Fri Nov 13 20:37:21 CET 2009


Excuse me,

"so I could have been it before" -> "so I could have done it before"

Regards.

> Hi Florian,
>
> I'm so sorry about my mistake, I'll promise to be more carefully in the
> future. Moreover I have already done the necesary tests so I could have
> been it before question the list. I'ts only that I am too "slowly? dumb?"
> reading and understanding the english language.
>
> Thank you very much.
>
>> On 11/13/2009 04:59 PM, Juan Antonio wrote:
>>> Hi again,
>>>
>>> Why the drbd documentation do not reference this issue in the
>>> "Configuring
>>> a DRBD resource as a Physical Volume" section?
>>
>> Because googling for "DRBD LVM" and hitting the LVM page in the user's
>> guide does not mean you should be skipping the Fundamentals chapter. :)
>>
>> From http://www.drbd.org/users-guide/s-resource-roles.html:
>>
>> "A DRBD device in the secondary role receives all updates from the peer
>> node's device, but otherwise disallows access completely."
>>
>> In other words, a pvscan on a Secondary device will never return a PV
>> signature for that device. For LVM's purposes, as long as that DRBD
>> resource is Secondary, no PV exists there. Make it Primary, rescan, and
>> as if by magic you'll see your PV sig, and your VG, and once you
>> activate it, all your PVs.
>>
>> At this point I'll assume that you have different lvm.conf "filter"
>> entries on your nodes. Please go back and fix that, and follow the LVM
>> chapter again (after you've made sure you've understood the
>> fundamentals). In your current configuration you're probably signing up
>> for losing data.
>>
>> Cheers,
>> Florian
>>
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>
>
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