From: NeilBrown <neilb@suse.de>
To: "Paramasivam, Meenakshisundaram" <mparamas@iupui.edu>
Cc: "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: mdadm raid6 recovery status
Date: Thu, 29 Mar 2012 10:27:04 +1100 [thread overview]
Message-ID: <20120329102704.14b08f2a@notabene.brown> (raw)
In-Reply-To: <B2B36B3006DB4C47A56D6BA19443F5D12DCEB63D@IU-MSSG-MBX110.ads.iu.edu>
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On Wed, 28 Mar 2012 12:49:18 +0000 "Paramasivam, Meenakshisundaram"
<mparamas@iupui.edu> wrote:
> [root@in-rady-neuro9 ~]# df -kl /myarray
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/md2 11537161976 162432 10950945196 1% /myarray
> Should be 7TB of used space.
This is bad. Something has happened to your filesystem.
It is almost as though someone ran "mkfs" on the array.
I don't know much about recovery after such an action, but I doubt you
will get much back.
>
> [root@in-rady-neuro9 ~]# cat /proc/partitions
> major minor #blocks name
>
> 8 0 438960128 sda
> 8 1 512000 sda1
> 8 2 51200000 sda2
> 8 3 387247104 sda3
> 8 16 1953514584 sdb
> 8 32 1953514584 sdc
> 8 48 1953514584 sdd
> 8 64 1953514584 sde
> 8 80 1953514584 sdf
> 8 96 1953514584 sdg
> 8 112 1953514584 sdh
> 8 128 1953514584 sdi
> 253 0 346226688 dm-0
> 253 1 40992768 dm-1
No md2 ???
>
> sd[b-i] are raid devices
>
> [root@in-rady-neuro9 ~]# mdadm --detail /dev/md2
> /dev/md2:
> Version : 0.90
> Creation Time : Fri Dec 16 17:56:14 2011
> Raid Level : raid6
> Array Size : 11721086976 (11178.10 GiB 12002.39 GB)
> Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) <<<====== Wrong! Should be 7TB of used array space.
"Used Dev Size" isn't "how much of the array is used by the filesystem" -
mdadm doesn't know anything about filesystems.
It is "How much of each individual device is used by the array", which is
usually a little less than the size of the smallest device.
So 2TB is correct here.
NeilBrown
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next prev parent reply other threads:[~2012-03-28 23:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-28 2:22 mdadm raid6 recovery status Paramasivam, Meenakshisundaram
2012-03-28 4:11 ` NeilBrown
2012-03-28 12:49 ` Paramasivam, Meenakshisundaram
2012-03-28 19:39 ` John Robinson
2012-03-28 23:27 ` NeilBrown [this message]
2012-03-29 17:33 ` Paramasivam, Meenakshisundaram
2012-03-29 18:47 ` Paramasivam, Meenakshisundaram
2012-03-29 19:41 ` NeilBrown
2012-03-30 21:22 ` Paramasivam, Meenakshisundaram
2012-03-30 22:51 ` NeilBrown
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