[nycbug-talk] Fwd: Adaptec AAC raid support

Marco Scoffier marco
Mon Mar 21 16:39:02 EST 2005

On Mon, Mar 21, 2005 at 03:57:28PM -0500, Marco Scoffier wrote:
>On Mon, Mar 21, 2005 at 03:31:10PM -0500, bruno wrote:
>>If you do need performance software raid is sometimes not enough.
>I was wondering if anyone had numbers on this.  Are we talking +5% cpu
>utilisation and -5% throughput or +20% and -20% or more ??  Searched a bit for
>numbers but came up dry.

ok found: 


Which compares raw disk with a raid5 and gets a ~10% cpu increase when running
the raid.  Does not compare a raid controller firmware managed raid vs kernel
level openbsd raidctl managed raid5.  I guess it is too hard to setup, unless
someone is making boxes everyday, and has lots of similar hardware to test out.



nice article about raidframe performance, but no comparisons.  Uses the nice
bonnie test : http://www.textuality.com/bonnie/

I understand its the knee jerk reaction to say hardware is faster, but knowing
exactly how much faster helps to color the decision.  Especially considering
the drawback of not-even ncurses based, bios-like interface of most firmware
raidcontroller software.


More information about the talk mailing list