[linux-lvm] replacing a failling disk on a mirrred VG.

[linux-lvm] replacing a failling disk on a mirrred VG.

[Georges Giralt]

Hi !
I run A Fedora Core 6 box with
lvm> version
   LVM version:     2.02.17 (2006-12-14)
   Library version: 1.02.13 (2006-11-28)
   Driver version:  4.10.0
lvm>
on a 2.6.19 kernel.
My VG comprises 3PV  onto which I've spread 4 mirrored LVs.
PV 0 : LV1 mirror copy 0, LV2 mirror copy 0, lv3 mirror copy 0 and lv4 
mirror copy 0
PV 1 : LV1 mirror copy 1, LV2 mirror log, LV3 mirror log and LV4 mirror 
copy 1
PV2 : LV1 mirror log, LV2 mirror copy 1 , LV3 mirror copy 1 and LV4 
mirror log.
I plan to replace (Smart signals a future failure) the PV #1.
Question : What is the best route to do this ? And is it feasible ?
Thanks a lot in advance for your answer !
-- 
Ce message est constitu� d'au moins 50 % d'�lectrons recycl�s.
S'il vous pla�t, aidez nous � conserver nos ressources,
recyclez vos �lectrons !

Re: [linux-lvm] replacing a failling disk on a mirrred VG.

[Jonathan E Brassow]

This one should be pretty easy...

Effectively, you want to keep the primary mirror devices, so do:
lvconvert -m0 <vg/lv>
to down convert them to linear devices.

Then remove PV1 (vgreduce), add a new disk to your system, add it to 
your vg (vgextend), and finally, up-convert the linear devices to 
mirrors again:
lvconvert -m1 <vg/lv>

  brassow

On Feb 4, 2007, at 12:53 PM, Georges Giralt wrote:

> Hi !
> I run A Fedora Core 6 box with
> lvm> version
>   LVM version:     2.02.17 (2006-12-14)
>   Library version: 1.02.13 (2006-11-28)
>   Driver version:  4.10.0
> lvm>
> on a 2.6.19 kernel.
> My VG comprises 3PV  onto which I've spread 4 mirrored LVs.
> PV 0 : LV1 mirror copy 0, LV2 mirror copy 0, lv3 mirror copy 0 and lv4 
> mirror copy 0
> PV 1 : LV1 mirror copy 1, LV2 mirror log, LV3 mirror log and LV4 
> mirror copy 1
> PV2 : LV1 mirror log, LV2 mirror copy 1 , LV3 mirror copy 1 and LV4 
> mirror log.
> I plan to replace (Smart signals a future failure) the PV #1.
> Question : What is the best route to do this ? And is it feasible ?
> Thanks a lot in advance for your answer !
> -- 
> Ce message est constitu� d'au moins 50 % d'�lectrons recycl�s.
> S'il vous pla�t, aidez nous � conserver nos ressources,
> recyclez vos �lectrons !
>
> _______________________________________________
> 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/
>

Re: [linux-lvm] replacing a failling disk on a mirrred VG.

[Steve Wray]

Jonathan E Brassow wrote:
> This one should be pretty easy...
> 
> Effectively, you want to keep the primary mirror devices, so do:
> lvconvert -m0 <vg/lv>
> to down convert them to linear devices.
> 
> Then remove PV1 (vgreduce), add a new disk to your system, add it to 
> your vg (vgextend), and finally, up-convert the linear devices to 
> mirrors again:
> lvconvert -m1 <vg/lv>

So you can't just add a new disk and use pvmove to move extents off of 
the failing disk?


> On Feb 4, 2007, at 12:53 PM, Georges Giralt wrote:
> 
>> Hi !
>> I run A Fedora Core 6 box with
>> lvm> version
>>   LVM version:     2.02.17 (2006-12-14)
>>   Library version: 1.02.13 (2006-11-28)
>>   Driver version:  4.10.0
>> lvm>
>> on a 2.6.19 kernel.
>> My VG comprises 3PV  onto which I've spread 4 mirrored LVs.
>> PV 0 : LV1 mirror copy 0, LV2 mirror copy 0, lv3 mirror copy 0 and lv4 
>> mirror copy 0
>> PV 1 : LV1 mirror copy 1, LV2 mirror log, LV3 mirror log and LV4 
>> mirror copy 1
>> PV2 : LV1 mirror log, LV2 mirror copy 1 , LV3 mirror copy 1 and LV4 
>> mirror log.
>> I plan to replace (Smart signals a future failure) the PV #1.
>> Question : What is the best route to do this ? And is it feasible ?
>> Thanks a lot in advance for your answer !

Re: [linux-lvm] replacing a failling disk on a mirrred VG.

[Jonathan E Brassow]

On Feb 6, 2007, at 11:41 AM, Steve Wray wrote:

> Jonathan E Brassow wrote:
>> This one should be pretty easy...
>> Effectively, you want to keep the primary mirror devices, so do:
>> lvconvert -m0 <vg/lv>
>> to down convert them to linear devices.
>> Then remove PV1 (vgreduce), add a new disk to your system, add it to 
>> your vg (vgextend), and finally, up-convert the linear devices to 
>> mirrors again:
>> lvconvert -m1 <vg/lv>
>
> So you can't just add a new disk and use pvmove to move extents off of 
> the failing disk?
>

You could if it was a linear device, but we are still working on the 
proper stacking of mirrors.

  brassow

Re: [linux-lvm] replacing a failling disk on a mirrred VG.

[Georges Giralt]

Jonathan E Brassow a �crit :
> This one should be pretty easy...
> 
> Effectively, you want to keep the primary mirror devices, so do:
> lvconvert -m0 <vg/lv>
> to down convert them to linear devices.
> 
> Then remove PV1 (vgreduce), add a new disk to your system, add it to 
> your vg (vgextend), and finally, up-convert the linear devices to 
> mirrors again:
> lvconvert -m1 <vg/lv>
> 
>  brassow
> 
> On Feb 4, 2007, at 12:53 PM, Georges Giralt wrote:
> 
>> Hi !
>> I run A Fedora Core 6 box with
>> lvm> version
>>   LVM version:     2.02.17 (2006-12-14)
>>   Library version: 1.02.13 (2006-11-28)
>>   Driver version:  4.10.0
>> lvm>
>> on a 2.6.19 kernel.
>> My VG comprises 3PV  onto which I've spread 4 mirrored LVs.
>> PV 0 : LV1 mirror copy 0, LV2 mirror copy 0, lv3 mirror copy 0 and lv4 
>> mirror copy 0
>> PV 1 : LV1 mirror copy 1, LV2 mirror log, LV3 mirror log and LV4 
>> mirror copy 1
>> PV2 : LV1 mirror log, LV2 mirror copy 1 , LV3 mirror copy 1 and LV4 
>> mirror log.
>> I plan to replace (Smart signals a future failure) the PV #1.
>> Question : What is the best route to do this ? And is it feasible ?
>> Thanks a lot in advance for your answer !
Hi Brassov !
Your method was like a walk in a park.
Thanks !

-- 
Ce message est constitu� d'au moins 50 % d'�lectrons recycl�s.
S'il vous pla�t, aidez nous � conserver nos ressources,
recyclez vos �lectrons !