Improving XFS file system inode performance

[Jesse Stroik]

On 11/22/2010 04:25 PM, Emmanuel Florac wrote:
> Le Mon, 22 Nov 2010 15:59:51 -0600 vous écriviez:
>
>> Performance was fine before the file system was filled -- last week
>> ~8TB showed up and filled the 20TB file system.  Since, it has been
>> performing poorly.
>
> Maybe it got fragmented? How does fragmentation look like?


I wasn't able to resolve this in reasonable time.  Part of the issue is 
that we're dealing with files within about 100k directories.  I'll 
attempt to get the fragmentation numbers overnight.

I suspect the regularly listed set of files on this fs exceeds the inode 
cache.  Where can I determine the cache misses and tune the file system?

Best,
Jesse