Re: Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug SAS/SATA Models (LSI SAS1068 - mpt)

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