* Convert RAID5 to RAID6 in a live system
@ 2011-03-23 7:43 Stefan Roese
2011-03-23 8:07 ` Mikael Abrahamsson
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Roese @ 2011-03-23 7:43 UTC (permalink / raw)
To: linux-raid
Hi,
I'm currently in the process of converting a 3 disk RAID5 array into a 4 disk
RAID5 array. I'm using mdadm 3.1.4 and Linux kernel 2.6.35-28-generic
(Ubuntu). My questions now is this conversion save in a live (running) system?
Or is this now allowed/supported?
Thanks.
Best regards,
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Convert RAID5 to RAID6 in a live system
2011-03-23 7:43 Convert RAID5 to RAID6 in a live system Stefan Roese
@ 2011-03-23 8:07 ` Mikael Abrahamsson
2011-03-23 8:14 ` Roman Mamedov
0 siblings, 1 reply; 5+ messages in thread
From: Mikael Abrahamsson @ 2011-03-23 8:07 UTC (permalink / raw)
To: Stefan Roese; +Cc: linux-raid
On Wed, 23 Mar 2011, Stefan Roese wrote:
> I'm currently in the process of converting a 3 disk RAID5 array into a 4 disk
> RAID5 array. I'm using mdadm 3.1.4 and Linux kernel 2.6.35-28-generic
> (Ubuntu). My questions now is this conversion save in a live (running) system?
> Or is this now allowed/supported?
I guess you wanted to say "4 disk RAID6 array"?
In that case, yes, I have done it on 2.6.32 and mdadm version (something
older) and it went just fine.
Neil wrote about it here <http://neil.brown.name/blog/20090817000931>.
--
Mikael Abrahamsson email: swmike@swm.pp.se
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Convert RAID5 to RAID6 in a live system
2011-03-23 8:07 ` Mikael Abrahamsson
@ 2011-03-23 8:14 ` Roman Mamedov
2011-03-23 9:07 ` Stefan Roese
0 siblings, 1 reply; 5+ messages in thread
From: Roman Mamedov @ 2011-03-23 8:14 UTC (permalink / raw)
To: Mikael Abrahamsson; +Cc: Stefan Roese, linux-raid
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On Wed, 23 Mar 2011 09:07:56 +0100 (CET)
Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> On Wed, 23 Mar 2011, Stefan Roese wrote:
>
> > I'm currently in the process of converting a 3 disk RAID5 array into a 4
> > disk RAID5 array. I'm using mdadm 3.1.4 and Linux kernel 2.6.35-28-generic
> > (Ubuntu). My questions now is this conversion save in a live (running)
> > system? Or is this now allowed/supported?
>
> I guess you wanted to say "4 disk RAID6 array"?
>
> In that case, yes, I have done it on 2.6.32 and mdadm version (something
> older) and it went just fine.
>
> Neil wrote about it here <http://neil.brown.name/blog/20090817000931>.
Additionally, I suggest that you also check "man mdadm" and note the
"--layout=preserve" option, if you use it, the RAID5 to RAID6 conversion while
adding one disk will happen instantly, without restriping (but only with a
resync of the new drive).
--
With respect,
Roman
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Convert RAID5 to RAID6 in a live system
2011-03-23 8:14 ` Roman Mamedov
@ 2011-03-23 9:07 ` Stefan Roese
2011-03-23 11:15 ` Mikael Abrahamsson
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Roese @ 2011-03-23 9:07 UTC (permalink / raw)
To: Roman Mamedov; +Cc: Mikael Abrahamsson, linux-raid
On Wednesday 23 March 2011 09:14:24 Roman Mamedov wrote:
> > > I'm currently in the process of converting a 3 disk RAID5 array into a
> > > 4 disk RAID5 array. I'm using mdadm 3.1.4 and Linux kernel
> > > 2.6.35-28-generic (Ubuntu). My questions now is this conversion save
> > > in a live (running) system? Or is this now allowed/supported?
> >
> > I guess you wanted to say "4 disk RAID6 array"?
> >
> > In that case, yes, I have done it on 2.6.32 and mdadm version (something
> > older) and it went just fine.
> >
> > Neil wrote about it here <http://neil.brown.name/blog/20090817000931>.
>
> Additionally, I suggest that you also check "man mdadm" and note the
> "--layout=preserve" option, if you use it, the RAID5 to RAID6 conversion
> while adding one disk will happen instantly, without restriping (but only
> with a resync of the new drive).
Thanks. I already started with this conversion, so this "--layout=preserve" is
not an option for me any more. But good to know that this conversion should
work. But its slow - it'll take approx. 4 days with my 2TB drives.
Best regards,
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Convert RAID5 to RAID6 in a live system
2011-03-23 9:07 ` Stefan Roese
@ 2011-03-23 11:15 ` Mikael Abrahamsson
0 siblings, 0 replies; 5+ messages in thread
From: Mikael Abrahamsson @ 2011-03-23 11:15 UTC (permalink / raw)
To: Stefan Roese; +Cc: Roman Mamedov, linux-raid
On Wed, 23 Mar 2011, Stefan Roese wrote:
> Thanks. I already started with this conversion, so this
> "--layout=preserve" is not an option for me any more. But good to know
> that this conversion should work. But its slow - it'll take approx. 4
> days with my 2TB drives.
Also, layout=preserve I guess would make it not a proper RAID6 but a RAID5
with a parity disk. This is not optimal long-term.
The time you mention is normal I'd say.
--
Mikael Abrahamsson email: swmike@swm.pp.se
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-03-23 11:15 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-03-23 7:43 Convert RAID5 to RAID6 in a live system Stefan Roese
2011-03-23 8:07 ` Mikael Abrahamsson
2011-03-23 8:14 ` Roman Mamedov
2011-03-23 9:07 ` Stefan Roese
2011-03-23 11:15 ` Mikael Abrahamsson
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