zfs discuss - Nov 2009 - Accidentally mixed-up disks in RAIDZ

Hello to you all,

Here''s the situation:

While doing a case replacement in my home storage server I accidentally removed
the post-it with the disk number from my three 1TB disks before connecting them
back to the corresponding SATA connector.
The issue now is that I don''t know in which order they should be
connected.

Do any of you know how can I _safely_ bring the zpool on-line?

I didn''t plugged''em in yet becasue I''m afraid of
losing some valueable personal information.

Thanks in advance.

Leandro.



      Yahoo! Cocina

Encontra las mejores recetas con Yahoo! Cocina.


http://ar.mujer.yahoo.com/cocina/
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On Sat, Nov 7, 2009 at 1:38 PM, Leandro Vanden Bosch
<l_vbosch at yahoo.com.ar>wrote:
> Hello to you all,
>
> Here''s the situation:
>
> While doing a case replacement in my home storage server I accidentally
> removed the post-it with the disk number from my three 1TB disks before
> connecting them back to the corresponding SATA connector.
> The issue now is that I don''t know in which order they should be
connected.
>
> Do any of you know how can I _safely_ bring the zpool on-line?
>
> I didn''t plugged''em in yet becasue I''m afraid of
losing some valueable
> personal information.
>
> Thanks in advance.
>
> Leandro.
>
> ------------------------------
>

Of course, it doesn''t matter which drive is plugged in where.  When you
import a pool, zfs scans the headers of each disk to verify if they''re
part
of a pool or not, and if they are, does the import.

--Tim
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Thanks Tim for your answer!

I''ll try it in afew hours and post the outcome.

Regards,

Leandro.




________________________________
De: Tim Cook <tim at cook.ms>
Para: Leandro Vanden Bosch <l_vbosch at yahoo.com.ar>
CC: zfs-discuss at opensolaris.org
Enviado: s?bado, 7 de noviembre, 2009 16:40:55
Asunto: Re: [zfs-discuss] Accidentally mixed-up disks in RAIDZ




On Sat, Nov 7, 2009 at 1:38 PM, Leandro Vanden Bosch <l_vbosch at
yahoo.com.ar> wrote:

Hello to you all,
>
>Here''s the situation:
>
>While doing a case replacement in my home storage server I accidentally
removed the post-it with the disk number from my three 1TB disks before
connecting them back to the corresponding SATA connector.
>>The issue now is that I don''t know in which order they should
be connected.
>
>Do any of you know how can I _safely_ bring the zpool on-line?
>
>I didn''t plugged''em in yet becasue I''m afraid of
losing some valueable personal information.
>
>Thanks in advance.
>
>Leandro.
>
>>
>
>________________________________


Of course, it doesn''t matter which drive is plugged in where.  When you
import a pool, zfs scans the headers of each disk to verify if they''re
part of a pool or not, and if they are, does the import.

--Tim


      Yahoo! Cocina

Encontra las mejores recetas con Yahoo! Cocina.


http://ar.mujer.yahoo.com/cocina/
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I can confirm that Tim is right, I have done it myself.
-- 
This message posted from opensolaris.org

No, Chris, I didn''t export the pool becasue I didn''t expect
this to
happen. It''s an excellent suggestion, so I''ll try it when I
get my
hands on the machine.

Thank you.

Leandro.



________________________________
De: Chris Murray <chrismurray84 at gmail.com>
Para: Leandro Vanden Bosch <l_vbosch at yahoo.com.ar>
Enviado: s?bado, 7 de noviembre, 2009 19:13:33
Asunto: RE: [zfs-discuss] Accidentally mixed-up disks in RAIDZ

 
Did you export the pool before unplugging the drives? I''ve had
occasions in the past where ZFS does get mixed-up if the machine is powered up
with the drives of a currently imported pool, in the wrong order. The solution
in the end was to power up without the drives, export the pool, and then import.
 
Chris
 
From:zfs-discuss-bounces at opensolaris.org
[mailto:zfs-discuss-bounces at opensolaris.org] On Behalf Of Leandro Vanden
Bosch
Sent: 07 November 2009 20:28
To: Tim Cook
Cc: zfs-discuss at opensolaris.org
Subject: Re: [zfs-discuss] Accidentally mixed-up disks in RAIDZ
 
Thanks
Tim for your answer!

I''ll try it in afew hours and post the outcome.

Regards,

Leandro.
 

________________________________
 
De:Tim Cook <tim at cook.ms>
Para: Leandro Vanden Bosch <l_vbosch at yahoo.com.ar>
CC: zfs-discuss at opensolaris.org
Enviado: s?bado, 7 de noviembre, 2009 16:40:55
Asunto: Re: [zfs-discuss] Accidentally mixed-up disks in RAIDZ



On Sat, Nov 7, 2009 at 1:38 PM, Leandro Vanden Bosch <l_vbosch at
yahoo.com.ar>
wrote:
Hello to you all,

Here''s the situation:

While doing a case replacement in my home storage server I accidentally removed
the post-it with the disk number from my three 1TB disks before connecting them
back to the corresponding SATA connector. 
The issue now is that I don''t know in which order they should be
connected.

Do any of you know how can I _safely_ bring the zpool on-line?

I didn''t plugged''em in yet becasue I''m afraid of
losing some valueable personal
information.

Thanks in advance.

Leandro.
 

________________________________
 


Of course, it doesn''t matter which drive is plugged in where.  When you
import a pool, zfs scans the headers of each disk to verify if they''re
part of
a pool or not, and if they are, does the import.

--Tim
 
 
 

________________________________
 

Encontra las
mejores recetas con Yahoo! Cocina. 
http://ar.mujer.yahoo.com/cocina/


      Yahoo! Cocina

Encontra las mejores recetas con Yahoo! Cocina.


http://ar.mujer.yahoo.com/cocina/
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Solved!

This what I did: boot with the disks unplugged, I took a ''digest -a md5
/etc/zfs/zpool.cache'', then I did ''zpool export -f
data'', I got an error message saying that the pool didn''t
exist. I checked again the MD5 against the zpool.cache and it effectively
changed (so, although the export appeared to fail, it actually did something). I
turned off the machine, plugged the disks back in and then I performed a
''zpool import'' without any issue.
All the properties retain their previous settings.

Thanks to all for your tips.

Regards,

Leandro.


      Yahoo! Cocina

Encontra las mejores recetas con Yahoo! Cocina.


http://ar.mujer.yahoo.com/cocina/
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