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Re: Unable to mount and repair filesystems

To: Gerard Beekmans <GBeekmans@xxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: Re: Unable to mount and repair filesystems
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 29 Jan 2015 14:18:14 -0600
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <D90435AEFF34654AA1122988C66C8678023F0277C9@xxxxxxxxxxxxxxxxxxx>
References: <D90435AEFF34654AA1122988C66C8678023F0277C9@xxxxxxxxxxxxxxxxxxx>
On 1/29/15 11:36 AM, Gerard Beekmans wrote:
> Hi,
>
> One of our VMware VMs crashed which has resulted in a few XFS filesystems 
> unable to mount and be repaired.
>
> Some VM details:
> -          Distribution is CentOS 7
> -          Partitions reside inside LVM
> -          Tried CentOS provided xfsprogs-3.2.0-alpha2 as well as manually 
> compiling 3.2.2
>
> When attempting to mount:
>
> [71895.922382] XFS (dm-9): Mounting Filesystem
> [71895.994614] XFS (dm-9): Starting recovery (logdev: internal)
> [71896.000910] XFS (dm-9): Metadata corruption detected at 
> xfs_agf_read_verify+0x70/0x120 [xfs], block 0x753001
> [71896.002304] XFS (dm-9): Unmount and run xfs_repair
> [71896.003649] XFS (dm-9): First 64 bytes of corrupted metadata buffer:
> [71896.005049] ffff8800b1200c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 00  ................
> [71896.006468] ffff8800b1200c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 00  ................
> [71896.007799] ffff8800b1200c20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 00  ................
> [71896.009116] ffff8800b1200c30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
> 00  ................

all zeros...

> [71896.010482] XFS (dm-9): metadata I/O error: block 0x753001 
> ("xfs_trans_read_buf_map") error 117 numblks 1
> mount: mount /dev/mapper/data-srv on /srv failed: Structure needs cleaning
>
>
> xfs_repair:
>
> xfs_repair /dev/mapper/data-srv
> Phase 1 - find and verify superblock...
> couldn't verify primary superblock - bad magic number !!!

bad first block, too.

Are you certain that the volume / storage behind dm-9 is in decent shape?  
(i.e. is it really even an xfs filesystem?)

A VM crashing definitely should not result in a badly corrupt/unmountable 
filesystem.

Is there any other interesting part of the story? :)

-Eric

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