Re: 3ware 9000 Controller Extremely Slow Performance



On Wed, 27 Feb 2008, danielatdaveschool@xxxxxxxxx wrote:

Ive not much experience with such things; I have setup a RAID5 on a
3ware 9500S-MI8 controller using the cards utility. I have created a
reiserfs partition on this drive, i access via /dev/sda, installed
gentoo. The kernel contains the 3w_9xxx driver as well as PIIX ide
driver for my i875 intel board. My problem isn't one of functionality
but one of speed, it is painfully slow. I might note as well that this
is a 32bit pci card.

Here's what a hdparm -tT /dev/sda yields

/dev/sda
Timing Cached Reads: 60MB in 2.14 seconds = 20.06 MB/sec
Timing Buffered Disk Reads: 22MB in 3.12 seconds = 7.05 MB/sec

That does look slow, although you have not said what your targets (disks) are.

There is some information on 3Ware's site about setting up your system for optimal performance, including such things as selecting the appropriate scheduler.

One more thought: are you sure that the RAID array is not still being initialized? This may take several hours to complete, during which time the performance of your array will be reduced.

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