2120S Stripe - abysmal performance

[Jens Schweikhardt]

On Thu, May 13, 2004 at 08:32:21AM -0600, Justin T. Gibbs wrote:
# > On Wed, May 12, 2004 at 01:07:51PM -0600, Scott Long wrote:
# > ...
# ># Something on the SCSI bus is very unhappy.  What drives are they?  What
# ># firmware rev?
# > 
# > 2 Fujitsu MAP3367NP with fw 0105. They've been working for a year
# > on my 29160 without a hitch.
# 
# At U320 speeds, I believe you need 0107 or better to have these
# drives work.  You should contact Fujitsu to ensure you have the
# latest firmware.

Okay, I contacted Fujitsu and now I have 0108 on both MAPs (quick answer
from their German web support mail form, thanks Fujitsu!). Indeed my
SCSI bus appears happy now. No more resets or other errors. I configured
all IDs for U320 again.

However, configuring a RAID 0 with both MAPs on the 2120S as the only
drives still gives a sustained read rate of 65MB/s (constant over the
whole stripe), while a single drive on the 29160 peaks at just over
70MB/s and drops to 40 at the inner cyls. I played around with the read
cache, which has NO effect (unlike Scott explained elsethread). I also
tried the TUNING tips from aac(4), e.g. hw.aac.iosize_max=96*1024 in
/boot/loader.conf, also no noticeable change in performance.

Should the 2120S be able to deliver more? With a vinum stripe I get
100MB/s. This is on a system with only 33MHz/32bit PCI (Asus A7N8X), and
both of 29160 and 2120S. Somehow I get a feeling I'm hitting some limit
that's just half the theoretical PCI bandwith of 133MB/s. Should I remove
the 29160 (with just a slow CDROM) and try again?

Is an update in order for the controller?
AAC0> controller details
Executing: controller details
Controller Information
----------------------
         Remote Computer: S
             Device Name: S
         Controller Type: No Info
             Access Mode: READ-WRITE
Controller Serial Number: Last Six Digits = BA12C0
         Number of Buses: 1
         Devices per Bus: 15
          Controller CPU: i960 R series
    Controller CPU Speed: 100 Mhz
       Controller Memory: 64 Mbytes
           Battery State: Not Present

Component Revisions
-------------------
                CLI: 1.0-0 (Build #5263)
                API: 1.0-0 (Build #5263)
    Miniport Driver: 4.0-0 (Build #6011)
Controller Software: 4.0-0 (Build #6011)
    Controller BIOS: 4.0-0 (Build #6011)
Controller Firmware: (Build #6011)
Controller Hardware: 2.64


Regards,

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