chrism@xxxxxxxxx wrote:
Feizhou wrote:
William Warren wrote:
as soon as you goto software raid 5 you'll get a good performance
hit. Head for the hardware raid cards then. You can get the 3ware
ide cards for 150 or less now.
don't know if it is still the case but ext3 + 3ware + ext3 = ultra
slow. you'd want to use XFS or some other filesystem...
argh...i missed the raid5 on 3ware part.
I keep hearing about this "slowness" thing. Here is a bonnie++ run on
one of my spare machines. This particular machine is also running 4
copies of Folding@Home in the background during the test. The array
being tested is on a 3Ware 9550 card with 8 500gig barracudas. The
filesystem is a standard ext3 filesystem with zero tweaks. It doesn't
appear that slow to me, but perhaps I'm just easy to please.
<shrug> You are free to not believe or to believe. Maybe the latest
Centos 4 kernel has a fix or something but ext3 + 3ware raid5 = slow
while XFS would fly. Are your 8 500GB configured in raid5 or raid10? If
it is raid10, then yes, it will fly. You switch to raid5 however and you
will experience a slow down. This is not limited to 3ware boards lower
than 95xx which suffer from lack of onboard memory to make things fly.
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