Troubleshooting a 3Ware 9550SX under 6.3

Patrick C pcloches at
Fri Aug 1 22:59:31 UTC 2008

This is a very important point. By turning the cache on, you have not
resolved an underlying performance issue, if there even is one. Please
try dd again with a well-sized bs= parameter, or use some more
accurate reporting like iozone, sysbench, etc.

Also, I am not sure how much memory is on the card, but that is likely
COMPLETELY in cache at that point so you're not learning anything.
Write a couple gigs to get some real numbers.


2008/6/9 Wojciech Puchar <wojtek at>:
>> dd if=/dev/zero of=testfile
>> 165760+0 records in
>> 165759+0 records out
>> 84868608 bytes transferred in 25.028232 secs (3390915 bytes/sec)
>> I think I ought to be able to get more than 3.2MB/sec out of this card,
> with default 512 bytes blocks - not much more
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