[WBEL-users] SCSI 2120S card
Denis Croombs
denis at just-servers.co.uk
Thu Jun 23 05:10:25 CDT 2005
>> When I run /sbin/hdparm -tT /dev/sda /dev/sda I get:-
>>
>> /dev/sda:
>> Timing buffer-cache reads: 2756 MB in 2.00 seconds = 1378.00 MB/sec
>> Timing buffered disk reads: 68 MB in 3.00 seconds = 22.67 MB/sec
>>
>> /dev/sda:
>> Timing buffer-cache reads: 3104 MB in 2.00 seconds = 1552.00 MB/sec
>> Timing buffered disk reads: 68 MB in 3.04 seconds = 22.37 MB/sec
>>
>> Has anyone any clues as to how to improve it.
>>
>Okay, I have recently had problems .. with an adaptec SATA Raid config
though ...
>a few things to check - in the actual card config ..
>Is it Direct I/O or Cached I/O ? (should be cached) is it Write through or
write back (I had more consistent results with >write back - YMMV) Is it
read-ahead, or adaptive read-ahead ? (I had a small performance gain with
straight read-ahead)
>Regards,
>Adrian Snyman
>Tel: (083)647-5299
Thanks for that I will try that now.
Denis
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