Re: Performance question

[Seth Mos <knuffie@xxxxxxxxx>]

At 12:57 18-2-2004 -0500, Joshua Baker-LePain wrote:
> I've pretty much ruled out hardware.  I've swapped the 3ware and rebuilt
> the array, and the disks all show good SMART data.

Have you considered raid 10 configuration? It will about halve the storage 
space but increase IO by a multiple.

You could flip the cover and see if the disks are pushed hard by the 
controller (leds on the 3ware controller). Although from what you described 
above it's probably a directory growing a bit on the large side.

> In narrowing down the problem, it seems that one particular (large)
> directory is the main culprit.  This dir is 471,401,788 KB big and has
> 3,377,520 files (~140KB/file average).  Is the large number of files the
> entire culprit?  If so, is there anything I can do to alleviate the
> problem?  I already 'mount -o logbufs=8'.  Here's xfs_info on that
> partition:
>
> meta-data=/data                  isize=256    agcount=227, agsize=1048576 blks
>          =                       sectsz=512

Perhaps creating the filessystem with a larger inode size like 512. You 
could also use version logs instead of version which mostly helped software 
raid 5 although this might help hardware as well.

Cheers

--
Seth
I don't make sense, I don't pretend to either. Questions?