From: NeilBrown <neilb@suse.de>
To: Aaron Greenspan <aarong@thinkcomputer.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: mdadm --grow Hard Drive Size Puzzle
Date: Mon, 1 Oct 2012 12:55:10 +1000 [thread overview]
Message-ID: <20121001125510.6cc0c2be@notabene.brown> (raw)
In-Reply-To: <67FBE301-6EF3-4B0D-87FC-8A3C66473416@thinkcomputer.com>
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On Sat, 29 Sep 2012 19:19:34 -0700 Aaron Greenspan <aarong@thinkcomputer.com>
wrote:
> Hi Neil,
>
> I found your personal web site by doing a Google search on mdadm, so I'm not sure if you are the right person to ask this of, or if it's a dumb question in the first place, but here's what I'm running into.
Yes, this is the right place to ask.
No, this is not a dumb question.
>
> I had a RAID 1 array on CentOS 6 (which comes with mdadm 3.2.3) of two 250GB SATA Western Digital hard drives. It was finally time to upgrade their capacity, so I purchased two 2TB SATA Seagate hard drives. I replaced them one at a time, first by removing old drive B (slot 1), then copying over the partitions from old drive A (slot 0) to new drive C (slot 1), and then swapping the drives so that I could copy the partitions from new drive C (slot 0) to drive D (slot 1).
>
> This generally worked fine, with one exception. As I said, the drives are 2TB each. Somehow I'm only being given 1TB to work with. Here's what mdadm reports for the first new drive:
Should work.... what kernel are you running? There was a bug between 2.6.30
and 2.6.37 which would have the effect.
A quick good search suggest that Centos 6 uses 2.6.32, which would be
affected until 2.6.32.27 which contains the fix.
If you reboot (or just stop the array and re-assemble it), md should get
itself sorted out and the --grow will work.
The commit that fixes the bug is c26a44ed1e552aaa1d4ceb7
NeilBrown
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next prev parent reply other threads:[~2012-10-01 2:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-30 2:19 mdadm --grow Hard Drive Size Puzzle Aaron Greenspan
2012-09-30 2:48 ` Chris Murphy
2012-10-01 2:55 ` NeilBrown [this message]
2012-10-01 4:55 ` Aaron Greenspan
2012-10-01 5:40 ` NeilBrown
2012-10-01 5:12 ` Aaron Greenspan
2012-10-01 5:56 ` Chris Murphy
2012-10-26 16:53 ` Emmanuel Noobadmin
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