Re: Optimize RAID0 for max IOPS?

Am 19.01.2011 08:11, schrieb Wolfgang Denk:

Dear Roberto Spadim,

In message [ref] you wrote:

quoted

maybe removing hwraid and using swraid may reduce speed (depend how
much cpu you use with hw and with sw)
what we can optimize? less I/O per seconds making as much useful
read/write data on array, how? good read/write algorithms for raid.
(for each device type, ssd, hd) but... like stefan, disks are your
bottleneck

No, they are not.  Run some benchmarks yourself if you don't believe
me.

Lol - I wouldn't have answered in the first place if I didn't have any
expertise.  So suit yourself - as you don't bring up any real numbers
(remember: you've got the weird setup, you asked, you don't have enough
money for the enterprise solution - so ...) nobody who worked with 3ware
controllers will believe you.

Even a single disk drive is performing better than the hw RAID under
this workload.

Well - that is the problem - simulate YOUR workload.  Actually I fear at
least one of your disks has a grown defect, which slows down / blocks
i/o.  Haven't seen any 9650SE RAID being slower than the same config in
a software raid.

Best regards,

Wolfgang Denk