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* Recomendations on raid controllers raid 1+0
@ 2008-03-13 12:33 Glyn Astill <glynastill@yahoo.co.uk>
2008-03-13 15:58 ` Re: Recomendations on raid controllers raid 1+0 Guillaume Smet <guillaume.smet@gmail.com>
0 siblings, 1 reply; 5+ messages in thread
From: Glyn Astill @ 2008-03-13 12:33 UTC (permalink / raw)
To: pgsql-performance
Hi chaps,
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.
Thing is I'm not entirely sure where to start, we're using 6 SAS
drives and also need a bbu cache. The perc5i has 256mb which I'm sure
would be fine for us.
We're using debian etch 64 bit.
What cards have you lot had success with?
Any tips would be appreciated.
___________________________________________________________
Rise to the challenge for Sport Relief with Yahoo! For Good
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^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: Recomendations on raid controllers raid 1+0
2008-03-13 12:33 Recomendations on raid controllers raid 1+0 Glyn Astill <glynastill@yahoo.co.uk>
@ 2008-03-13 15:58 ` Guillaume Smet <guillaume.smet@gmail.com>
0 siblings, 0 replies; 5+ messages in thread
From: Guillaume Smet @ 2008-03-13 15:58 UTC (permalink / raw)
To: Glyn Astill <glynastill@yahoo.co.uk>; +Cc: pgsql-performance
Glyn,
On Thu, Mar 13, 2008 at 1:33 PM, Glyn Astill <glynastill@yahoo.co.uk> 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
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: Recomendations on raid controllers raid 1+0
@ 2008-03-13 16:10 Glyn Astill <glynastill@yahoo.co.uk>
2008-03-13 23:14 ` Re: Recomendations on raid controllers raid 1+0 Leigh Dyer <leigh@eclinic.com.au>
0 siblings, 1 reply; 5+ messages in thread
From: Glyn Astill @ 2008-03-13 16:10 UTC (permalink / raw)
To: Guillaume Smet <guillaume.smet@gmail.com>; +Cc: pgsql-performance
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@gmail.com>
> To: Glyn Astill <glynastill@yahoo.co.uk>
> Cc: pgsql-performance@postgresql.org
> Sent: Thursday, 13 March, 2008 3:58:41 PM
> Subject: Re: [PERFORM] 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
___________________________________________________________
Rise to the challenge for Sport Relief with Yahoo! For Good
http://uk.promotions.yahoo.com/forgood/
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: Recomendations on raid controllers raid 1+0
2008-03-13 16:10 Re: Recomendations on raid controllers raid 1+0 Glyn Astill <glynastill@yahoo.co.uk>
@ 2008-03-13 23:14 ` Leigh Dyer <leigh@eclinic.com.au>
2008-03-14 05:53 ` Re: Recomendations on raid controllers raid 1+0 Scott Marlowe <scott.marlowe@gmail.com>
0 siblings, 1 reply; 5+ messages in thread
From: Leigh Dyer @ 2008-03-13 23:14 UTC (permalink / raw)
To: Glyn Astill <glynastill@yahoo.co.uk>; +Cc: Guillaume Smet <guillaume.smet@gmail.com>; pgsql-performance
Glyn Astill wrote:
> 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.
>
Could you build three RAID-1 mirrors on the device, and then stripe that
using software RAID-0?
Thanks
Leigh
>
> 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@gmail.com>
>> To: Glyn Astill <glynastill@yahoo.co.uk>
>> Cc: pgsql-performance@postgresql.org
>> Sent: Thursday, 13 March, 2008 3:58:41 PM
>> Subject: Re: [PERFORM] 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
>
>
> ___________________________________________________________
> Rise to the challenge for Sport Relief with Yahoo! For Good
>
> http://uk.promotions.yahoo.com/forgood/
>
>
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: Recomendations on raid controllers raid 1+0
2008-03-13 16:10 Re: Recomendations on raid controllers raid 1+0 Glyn Astill <glynastill@yahoo.co.uk>
2008-03-13 23:14 ` Re: Recomendations on raid controllers raid 1+0 Leigh Dyer <leigh@eclinic.com.au>
@ 2008-03-14 05:53 ` Scott Marlowe <scott.marlowe@gmail.com>
0 siblings, 0 replies; 5+ messages in thread
From: Scott Marlowe @ 2008-03-14 05:53 UTC (permalink / raw)
To: Leigh Dyer <leigh@eclinic.com.au>; +Cc: Glyn Astill <glynastill@yahoo.co.uk>; Guillaume Smet <guillaume.smet@gmail.com>; pgsql-performance
On Thu, Mar 13, 2008 at 5:14 PM, Leigh Dyer <leigh@eclinic.com.au> wrote:
> Glyn Astill wrote:
> > 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.
> >
>
> Could you build three RAID-1 mirrors on the device, and then stripe that
> using software RAID-0?
That can be a useful option. You'd have to test it on your setup, but
RAID-0 is dead simple, so letting the kernel handle the RAID-0 part is
pretty low cost. Especially if you've got lots of CPU power, like
many of today's servers.
^ permalink raw reply [nested|flat] 5+ messages in thread
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2008-03-13 12:33 Recomendations on raid controllers raid 1+0 Glyn Astill <glynastill@yahoo.co.uk>
2008-03-13 15:58 ` Guillaume Smet <guillaume.smet@gmail.com>
2008-03-13 16:10 Re: Recomendations on raid controllers raid 1+0 Glyn Astill <glynastill@yahoo.co.uk>
2008-03-13 23:14 ` Leigh Dyer <leigh@eclinic.com.au>
2008-03-14 05:53 ` Scott Marlowe <scott.marlowe@gmail.com>
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