> Another test I might suggest is looking at the output of iostat -D > when you're trying to do these really slow writes. Well, I don't want to post another screenfull of data, but, for example, with the Level 5 RAID at 8SpSU and 16k fsbsize, during both the svn update and the touch..rm test, the raid is nearly 100% busy, while the individual discs are only 20% to 60% busy.
I do have all that data for all of the combinations in my lengthy post in case individual figures matter.
