3Ware 7500-4 Slow

[Chuck Swiger]

Jeff Tchang wrote:
[ ... ]
> When I attempt to write many small files or remove a directory is when the 
> slowness kicks in. Is this just something due to Raid5? Here is the output 
> of Bonnie++:

Small writes are pretty much the worst-case scenario for RAID-5, and it's 
normal to see a very significant performance drop-- by up to an order of 
magnitude-- from the performance of a bare drive.  Good RAID controllers with 
lots of RAM can reduce the performance hit to perhaps less than a factor of 2.

Choosing RAID-1 rather than RAID-5 for situations which are not read-only or 
read-mostly is probably a good idea.

-- 
-Chuck