Date: Thu, 18 Oct 2007 01:58:12 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Richard Tector <richardtector@thekeelecentre.com> Cc: freebsd-current@freebsd.org, Stefan Lambrev <stefan.lambrev@moneybookers.com> Subject: Re: Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug SAS/SATA Models (LSI SAS1068 - mpt) Message-ID: <20071018085812.GA8481@eos.sc1.parodius.com> In-Reply-To: <47171750.8050906@thekeelecentre.com> References: <47161A42.2050306@moneybookers.com> <471636E4.90807@thekeelecentre.com> <47163ACC.1080807@moneybookers.com> <47163B9B.4010901@thekeelecentre.com> <471715AD.3080102@moneybookers.com> <47171750.8050906@thekeelecentre.com>
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On Thu, Oct 18, 2007 at 09:20:32AM +0100, Richard Tector wrote:
> Stefan Lambrev wrote:
>> Enabling write cache really helps, so now I have to find a battery backup
>> unit for the controller (if it supports it).
>> Anyway here are the results of bonnie++ :
>> Version 1.93c ------Sequential Output------ --Sequential Input-
>> --Random-
>> Concurrency 1 -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
>> netguard.com 16G 416 99 63957 15 26411 8 702 99 70399 13 192.2
>> 5
>> Latency 21185us 462ms 785ms 22855us 134ms
>> 139ms
>> Version 1.93c ------Sequential Create------ --------Random
>> Create--------
>> netguard.com -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
>> files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
>> /sec %CP
>> 256:65536:65536/16 865 13 897 9 30908 60 858 13 88 2 6251
>> 48
>> Latency 1082ms 136ms 357ms 1678ms 3044ms
>> 1065ms
>> 1.93c,1.93c,netguard..com,1,1192619536,16G,,416,99,63957,15,26411,8,702,99,70399,13,192.2,5,256,65536,65536,,16,865,13,897,9,30908,60,858,13,88,2,6251,48,21185us,462ms,785ms,22855us,134ms,139ms,1082ms,136ms,357ms,1678ms,3044ms,1065ms
>> But isn't 70MB/s sequential read little slow for raid 1 with 2x500GB SATA
>> II HDDs?
>
> 70MB/s from desktop drives is pretty respectabloe, IMHO.
In a RAID 1 configuration, I would say 70MByte/sec read is more than
decent. That's about what I get from an individual drive on a built-in
nVidia nForce 4 SATAII controller. Here's a sequential read from a disk
on that controller, using dd and gstat; sometimes it hits 78MB.
ad10: 476940MB <Seagate ST3500630AS 3.AAE> at ata5-master SATA300
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
1 571 571 72850 1.4 0 0 0.0 82.0| ad10
You might also want to verify that the disks are actually running
at SATA300 speeds (which won't necessarily gain you a lot over SATA150,
but worth turning on assuming it's compatible with your controller).
Seagate drives, for example, have a little jumper on them that limits
the interface to SATA150; remove it.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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