Re: XFS filesystem reports as full though it isn't

[Christoph Hellwig <hch@infradead.org>]

On Fri, May 16, 2008 at 10:27:55PM +0200, Emmanuel Florac wrote:
> cluster1:/proc/sys/fs# xfs_db -r -c 'freesp -s -a 0' /dev/vg0/lv0
>    from      to extents  blocks    pct
>       1       1       5       5  71.43
>       2       3       1       2  28.57
> total free extents 6
> total free blocks 7
> average free extent size 1.16667
> 
> 7 blocks free? But there are 9 TB of free space! 

The -a 0 means you're only looking at the first AG, which given the
history of the filesystem has a fair chance to be full.  To get the
summary for all AG do a

	xfs_db -r -c 'freesp -s' /dev/vg0/lv0

No idea yet on what could cause your problem, sorry.

> The only significant thing I see is that the FS is really close to 16
> TB of allocated data (15.7TB). I tried mounting it with "inode64"
> option with no more loving.

Did you remount it with that option as in mount -o remount or did you
completely unmount it and mount it again?  Unfortunately none of the
xfs-specific mount options can be reset with remount yet, and it doesn't
return an error either (both are added to my todo list now)