I also am having a similar issue. I have a Dell Power Edge 2650 with a PERC 3/Di configured as RAID5 and an XFS root filesystem. I see periodic bursts of slowness with disk IO especially with writes after I did an upgrade from Etch to Lenny. For now I am using the 2.6.18 Etch kernel and performance is consistant.





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Maybe this is the same issue that I've reported here:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=577211 , if so, I suggest the
bug reports should be merged.
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