Re: 3ware 9000 Controller Extremely Slow Performance

On Feb 28, 12:23 am, danielatdavesch...@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

I have no experience with raid controllers so my initial thoughts were
no dma, io @ 16bit, but these are not options via hdparm on /dev/sda.
I looked through tw_cli man page to find anything related to
performance and found nothing except about cache, which was on, and a ?
profile? being set to performance ?if bbu is turned off? which wasn't
much relevant. I cant find anyone with similar performance searching
on google either for the past 5 hours.

Does anyone have any ideas, advice, anything? Im starting to feel a
bit lost to this problem, if it is indeed a problem and not simply a
result of my hardware configuration.

ok well i just came across this link
http://lxer.com/module/forums/t/26605/
and on the post dated @ Jan 16, 2008 12:32 PM, it looks like that
profile being set to performance is the key factor to my write speeds
not being 7mbs a second.
The only problem is
tw_cli$>/c0/u0 set storsave=perform
asks if i really want to do this and i say yes,
and it bombs with
... Failed
Error (CLI:108) invalid unit set storsave policy command.

a manual i was reading through somewhere said storsave is disabled if
cache is off when unit is created, i wasn't the one to create this
unit but cache was on when i checked. Going to recreate unit with a
storsave profile and hopefully that will work. I guess this kinda
falls out of the hardware section now
.

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