RAID-5 Expansion

RAID-5 Expansion

[Patrick Hoover]

Is the only way to increase the size of a RAID-5 array to push the
data somewhere else and create a new array including the new device?
This is the only solution I have come across so far.


-Pat

Re: RAID-5 Expansion

[David M. Strang]

EMVS supports this --

http://evms.sourceforge.net

However, in my experience -- it's really slow; and it was faster for me to 
backup the data to tape; recreate the raid and restore.

It may be faster now; that was under release v2.5.1

David M. Strang


----- Original Message ----- 
From: Patrick Hoover
To: linux-raid
Sent: Monday, August 29, 2005 4:05 PM
Subject: RAID-5 Expansion


Is the only way to increase the size of a RAID-5 array to push the
data somewhere else and create a new array including the new device?
This is the only solution I have come across so far.


-Pat
-
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Re: RAID-5 Expansion

[Patrick Hoover]

I had come across EVMS. It seems like overkill for me to go that route
when I am just looking for a one-time resize. A few years back I had
used "raidreconf" to successfully resize an array. Given its age and
the reports I have seen, I can't use that. If we are being forced down
the EVMS path, I'll consider it. However, it would be much more
convenient to have a utility that works directly with the RAID-5
array.


-Pat

On 8/29/05, David M. Strang <dstrang@shellpower.net> wrote:
> EMVS supports this --
> 
> http://evms.sourceforge.net
> 
> However, in my experience -- it's really slow; and it was faster for me to
> backup the data to tape; recreate the raid and restore.
> 
> It may be faster now; that was under release v2.5.1
> 
> David M. Strang
> 
> 
> ----- Original Message -----
> From: Patrick Hoover
> To: linux-raid
> Sent: Monday, August 29, 2005 4:05 PM
> Subject: RAID-5 Expansion
> 
> 
> Is the only way to increase the size of a RAID-5 array to push the
> data somewhere else and create a new array including the new device?
> This is the only solution I have come across so far.
> 
> 
> -Pat
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
>

Re: RAID-5 Expansion

[Mike Tran]

On Mon, 2005-08-29 at 15:12, David M. Strang wrote:
> EMVS supports this --
> 
> http://evms.sourceforge.net
> 
> However, in my experience -- it's really slow; and it was faster for me to 
> backup the data to tape; recreate the raid and restore.
> 
> It may be faster now; that was under release v2.5.1
> 
> David M. Strang
> 

With current evms, raid5 resize is still slow, sorry :(.  Improving I/O
performance during resize is in my to-do list.

--
Regards,
Mike T.