From: Phillip Susi <psusi@ubuntu.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: Shrinking raid array
Date: Tue, 12 Feb 2013 13:11:36 -0500 [thread overview]
Message-ID: <511A85D8.5070803@ubuntu.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1302121852000.32644@uplift.swm.pp.se>
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On 2/12/2013 12:53 PM, Mikael Abrahamsson wrote:
> On Tue, 12 Feb 2013, Phillip Susi wrote:
>
>> I just noticed that reducing the used dev size has not moved the
>> metadata, so it is looking like it just isn't possible to shrink
>> the md partition with metadata format 1.0?
>
> From "man mdadm"
>
> "The different sub-versions store the superblock at different
> locations on the device, either at the end (for 1.0), at the start
> (for 1.1) or 4K from the start (for 1.2)"
>
> I don't really see how it could be shrunk with a superblock at the
> end, then you wouldn't be able to find it next time...
You move the superblock, then shrink the partition...
But it looks like mdadm doesn't move the superblock even though it no
longer is using the full partition.
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next prev parent reply other threads:[~2013-02-12 18:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-12 15:52 Shrinking raid array Phillip Susi
2013-02-12 16:39 ` Phillip Susi
2013-02-12 17:53 ` Mikael Abrahamsson
2013-02-12 18:11 ` Phillip Susi [this message]
2013-02-12 18:43 ` Mikael Abrahamsson
2013-02-12 19:13 ` Phillip Susi
2013-02-13 5:12 ` Mikael Abrahamsson
2013-02-13 5:17 ` Mikael Abrahamsson
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