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Re: XFS on ARM-based Linux on USR8700 NAS appliance w/ mdadm/RAID5

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: XFS on ARM-based Linux on USR8700 NAS appliance w/ mdadm/RAID5
From: Harry Mangalam <harry.mangalam@xxxxxxx>
Date: Mon, 23 Feb 2009 14:24:24 -0800
Cc: xfs@xxxxxxxxxxx
In-reply-to: <49A31AFD.8070804@xxxxxxxxxxx>
Organization: NACS
References: <200902231243.33897.harry.mangalam@xxxxxxx> <200902231345.25062.harry.mangalam@xxxxxxx> <49A31AFD.8070804@xxxxxxxxxxx>
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mount -t xfs -o loop,offset=11403264,ro,norecovery /dev/md0 /lost

gives me a mount(!!):

df -> /lost/public, but it's not a standard entry:
?--------- ? ?    ?    ?    ? /lost/public

and dmesg coughs up many lines of XFS errors:

loop: AES key scrubbing enabled
loop: loaded (max 8 devices)
Filesystem "loop0": Disabling barriers, not supported by the 
underlying device
Mounting filesystem "loop0" in no-recovery mode.  Filesystem will be 
inconsistent.
XFS resetting qflags for filesystem loop0
xfs_force_shutdown(loop0,0x1) called from line 424 of file 
fs/xfs/xfs_rw.c.  Return address = 0xfb2fc728
Filesystem "loop0": I/O Error Detected.  Shutting down filesystem: 
loop0
Please umount the filesystem, and rectify the problem(s)
xfs_force_shutdown(loop0,0x1) called from line 424 of file 
fs/xfs/xfs_rw.c.  Return address = 0xfb2fc728
Filesystem "loop0": Disabling barriers, not supported by the 
underlying device
Mounting filesystem "loop0" in no-recovery mode.  Filesystem will be 
inconsistent.
XFS resetting qflags for filesystem loop0




On Monday 23 February 2009, Eric Sandeen wrote:
> try mount -o loop,offset=11403264 /dev/whatever /mnt/whatever
>
> I'd probably also add ro,norecovery to the options as well so you
> don't actually write anything to it at this point.
>
> -Eric



-- 
Harry Mangalam - Research Computing, NACS, E2148, Engineering Gateway, 
UC Irvine 92697  949 824-0084(o), 949 285-4487(c)
---
Good judgment comes from experience; 
Experience comes from bad judgment. [F. Brooks.]

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