Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug
SAS/SATA Models (LSI SAS1068 - mpt)
Stefan Lambrev
stefan.lambrev at moneybookers.com
Thu Oct 18 01:13:42 PDT 2007
Hi,
Richard Tector wrote:
> Stefan Lambrev wrote:
>> Richard Tector wrote:
>>> Stefan Lambrev wrote:
>>>> Hi list,
>>>>
>>>> I'm having problems with the raid controller of HP ProLiant DL140
>>>> G3 Server and RELENG_7
>>>>
>>>> I have 2x 500GB SATA HDDs configured as mirror, but the write speed
>>>> is very slow ~7MB/s.
>>>>
>>>> I guess that there is no battery for the raid controller and the
>>>> write cache is off, but 7MB/s ..
>>>> Also there is no way to see the status of the raid from FreeBSD ?
>>>>
>>>> Any ideas how to improve this?
>>>
>>> Write cache is the most probable cause.
>>> You can force it on with:
>>> hw.mpt.enable_sata_wc=1
>
>> This have to be put in /boot/loader.conf as I do not see such sysctl?
>> Anyway I'll force the write cache to be always on from the raid
>> configuration if this does not work.
>
> If you have the option in the RAID bios. Try that first.
> Failing that, yes, pop that in /boot/loader.conf, and it should do the
> trick.
>
> Regards,
>
> Richard
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?
--
Best Wishes,
Stefan Lambrev
ICQ# 24134177
More information about the freebsd-current
mailing list