Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug
SAS/SATA Models (LSI SAS1068 - mpt)
Richard Tector
richardtector at thekeelecentre.com
Thu Oct 18 01:20:43 PDT 2007
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
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