[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




More information about the Whitebox-users mailing list