[linux-lvm] metadata too large for circular buffer - any way to increase PV metadatasize?

[Charles Koprowski]

2016-09-29 11:23 GMT+02:00 Zdenek Kabelac <zkabelac at redhat.com>:

> Dne 28.9.2016 v 15:51 Charles Koprowski napsal(a):
>
>>  On Sun, 10 Aug 2008 18:45:16 +0100, John Leach wrote:
>>
>>     On Thu, 2008-08-07 at 20:41 +0100, Alasdair G Kergon wrote:
>>     > To remove the metadata areas you need to:
>>     >
>>     >    get an up-to-date metadata backup (vgcfgbackup)
>>     >
>>     >   pvcreate --restorefile pointing at a copy of that backup file
>>     requesting 0 metadata areas
>>     > and specifying the same uuid as it had before
>>     >
>>     >   vgcfgrestore from the backup file
>>     >
>>     This doesn't look like something you can do with the volume group
>> active
>>     (with cluster lvm anyway):
>>     [root testnode0 ~]# pvcreate --restorefile san-metadata -u
>>     fTLglk-j1C1-02Z7-8k6l-DTAm-2WNj-9ZGT19 --metadatacopies 0 /dev/hdb
>> -ff
>>     Really INITIALIZE physical volume "/dev/hdb" of volume group "san"
>> [y/n]? y
>>       Can't open /dev/hdb exclusively.  Mounted filesystem?
>>     Is that right, or am I missing something?
>>
>>
>> Hi John,
>>
>> I know it's been a long time but, Did you found out a solution for this ?
>>
>> I'm trying to follow the same scenario to increase the metadatasize and
>> got
>> stuck at the same point.
>>
>
>
>
>
> Hi
>
> I've no real idea what's the original problem  - but here is clear error
> on user side. This message:
>
> "Can't open /dev/hdb exclusively.  Mounted filesystem?"
>
> indicates that device is NOT UNUSED and it has to be unused for this
> operation - i.e. you MAY NOT run this operation while there are active LVs
> from this PV (one of possible reasons why  'hdb' cannot be opened
> exclusively)
>
>
>

Hi Zdenek,

I'm running a 5 nodes XEN dom0s cluster which uses a shared VG and few
hundreds LVs to store virtual machines disks.

As we were running out of space in the actual VG, I was about to add a new
PV and take the opportunity to increase the metadata size as you described
below.

I was wondering if I could run the "pvcreate --restorefile --metadatacopies
0" while the VG (and PV) were online.

Now I got the answer :-)

Thank you !

Charles



>
> To increase 'metadata' size - you ether have to add some NEW PV with
> much bigger metadata size space (and such operation still needs some
> extra space to proceed with existing size). Then disable existing metadata
> areas - so you will end-up of storing bigger MDA only to this new bigger
> MDA on a new PV -  note - it's quite risky plan to leave MDA only on single
> PV in multi-PV VG  - so I'd not advice this for any serious use.
>
> You may PV via pvmove to a new bigger PV.
> (adviced operation - though it may take its time...)
>
> There is NOT lvm2  native support for  'online' resize of PV mda size -
> and while it's possible to do this operation manually - it's quite complex
> task - so I'd not advice to do this either - unless you have FULL backup of
> everything.
>
> So back to your original problem - please describe  EXACTLY what is your
> problem and attach  outputs of  pvs,vgs,lvs  and what you want to achieve.
>
>
> Regards
>
> Zdenek
>
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>



-- 
Charles Koprowski
Systems & Networks
<http://www.audaxis.com/>
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