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

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.

Richard