Re: Improving XFS file system inode performance

Jesse Stroik
2010-11-22T22:30:30Z

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