From: Neil Brown <neilb@suse.de>
To: "Keith ." <lukano@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Shrink mdadm RAID5 from 6 disks to 5?
Date: Fri, 21 May 2010 07:34:33 +1000 [thread overview]
Message-ID: <20100521073433.75a59a99@notabene.brown> (raw)
In-Reply-To: <AANLkTimSxarJKmCxfOkJZJJULplm0z1pbVKyQpCG6nEw@mail.gmail.com>
On Thu, 20 May 2010 07:45:23 -0600
"Keith ." <lukano@gmail.com> wrote:
> Does mdadm 3.1.x not support shrinking the number of disks in a RAID5 array?
>
> I have successfully converted my 6x1.5tb RAID6 array to a 6x1.5tb
> RAID5 array. The issue that I now face is that one of those 6 drives
> is failed / removed, and as a result - the new RAID5 array is down
> it's parity drive.
>
> I knew I was short a disk when I started the process, but I was under
> the assumption that mdadm now supported shrinking of RAID5/6 arrays.
> Am I mistaken, or can anyone throw some suggestions at me so I can
> give it a try?
It should work.
mdadm -G /dev/mdX --raid-devices 5 --array-size=XXXXX
--backup=/root/backup-file
If you don't give the 'array-size' value mdadm will tell you what it has to
be. You need to be sure that all your data is already within that space.
NeilBrown
next prev parent reply other threads:[~2010-05-20 21:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 13:45 Shrink mdadm RAID5 from 6 disks to 5? Keith .
2010-05-20 21:34 ` Neil Brown [this message]
2010-05-20 21:42 ` Keith .
2010-05-20 22:32 ` Neil Brown
[not found] ` <AANLkTikQcA98OzjFn93X8ChJanHMLTIdrvrIEMQAU4lA@mail.gmail.com>
[not found] ` <AANLkTilJqmd9jwNSdlBxA4G07bB7RLB6XR0AwqFhe5uk@mail.gmail.com>
2010-05-30 22:54 ` Keith .
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