2120S Stripe - abysmal performance

[Jens Schweikhardt]

On Wed, May 12, 2004 at 08:32:31PM +0200, Jens Schweikhardt wrote:
# On Wed, May 12, 2004 at 11:48:06AM -0600, Scott Long wrote:
# ...
# # I can't remember how the 2100 BIOS works, I'll have to take a look.
# # I thought that it was an attribute that was set when the array is
# # created.
# 
# Yes, and once its set at array creation time it apparently can not be
# changed. I deleted the array and created it anew to disable read
# caching. This did not yield any perfomance gain by itself. After I
# changed the cables I now have 79MB/s (formerly only 29MB/s, a single
# disk has a sustained read speed of 71MB/s at the outer sectors). Next
# thing will be going back from forced U160 mode to U320. I'll report the
# results, so watch this space :-)

Went back to U320 and enabled packetized--even with the Adaptec
cable that came with the controller no joy :-(

At first, dd reported 83MB/s but after skipping the first 1G the
controller(?) made a high pitched beep, and this was in dmesg

aac0: **Monitor** SCSI bus reset issued on channel 0
aac0: **Monitor**  <...repeats 2 more times>
aac0: **Monitor** Drive 0:14:0 online on container 0:
aac0: **Monitor** Drive 0:15:0 online on container 0:
aac0: **Monitor** SCSI bus reset issued on channel 0
aac0: **Monitor**  <...repeats 1 more times>
aac0: **Monitor** Drive 0:14:0 online on container 0:
aac0: **Monitor** Drive 0:15:0 online on container 0:
aac0: **Monitor** SCSI bus reset issued on channel 0
aac0: **Monitor** Drive 0:15:0 returning error
aac0: **Monitor** ID(0:15:0) - Cmd[0x28] failed (retries exhausted)
aac0: **Monitor** Alarm Adapter Event -- turning Alarm On!
aac0: **Monitor**  Container 0 returning error on drive 0:15:0
aacd0: hard error cmd=read 2551359-2551486
aacd0: hard error cmd=read 5013567-5013694
...
aacd0: hard error cmd=read 35094591-35094718
aacd0: hard error cmd=read 35094719-35094846
aacd0: hard error cmd=read 35094591-35094718
aacd0: hard error cmd=read 35094719-35094846
aacd0: hard error cmd=read 37601343-37601470
aacd0: hard error cmd=read 37601471-37601598
aacd0: hard error cmd=read 37601343-37601470
aacd0: hard error cmd=read 37601471-37601598
aacd0: hard error cmd=read 37601343-37601470
aacd0: hard error cmd=read 37601471-37601598
aac0: **Monitor** ID(0:15:0) - Cmd[0x2a] failed (retries exhausted)
aac0: **Monitor** Last Adapter Alarm Event -- Alarm turning off!
Error probing container 0
aacd0: detached
aac0: **Monitor** Drive 0:14:0 online

Hmm. Should I still go for another U320 cable?

Regards,

	Jens
-- 
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)