Bonie++ benchmarks below.
I believe the the Perc 5/i Raid 10 mode is actually a span of mirrors, rather than the expected stripe of mirrors we should expect from 1+0, and that this is the reason for the shitty performance.
RAID 5
======
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
way5a 32096M 55354 97 201375 59 109586 23 59934 97 427541 33 767.9 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
way5a,32096M,55354,97,201375,59,109586,23,59934,97,427541,33,767.9,1,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
RAID 10
=======
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
Way5a 32096M 53479 99 131640 33 66718 10 58225 95 339287 25 699.1 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
Way5a,32096M,53479,99,131640,33,66718,10,58225,95,339287,25,699.1,1,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
----- Original Message ----
> From: Guillaume Smet <guillaume.smet@xxxxxxxxx>
> To: Glyn Astill <glynastill@xxxxxxxxxxx>
> Cc: pgsql-performance@xxxxxxxxxxxxxx
> Sent: Thursday, 13 March, 2008 3:58:41 PM
> Subject: Re: Recomendations on raid controllers raid 1+0
>
> Glyn,
>
> On Thu, Mar 13, 2008 at 1:33 PM, Glyn Astill wrote:
> > I'm looking at switching out the perc5i (lsi megaraid) cards from our
> > Dell 2950s for something else as they're crap at raid 10.
>
> Do you have numbers? Perc 5/i cards perform quite well for us (we have
> a 8 disks RAID 10 in a 2900 server with the traditional Perc 5/i).
>
> --
> Guillaume
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