[ Tuesday, March 14, 2000 ] Christian Robottom Reis wrote:
> Just FYI, a run on a Netfinity 5000 with a ServeRAID card and two IBM 8G
> LVD disks plugged into a backplane. I can dig up the model if it makes
> things more meaningful. mem=16M, runlevel 1, numruns 5.. you know the
> drill. AFAICS to me the ServeRAID is LVD as well, which should give us
> 80Mb/s max theoretical throughput.
which backplane? first-rev timpani enclosure (just an ibm repackage
after buying a company) had problems that put a limit around 11-12 MB/sec
in what you could get (which made my tracing efforts take a *long*
time at 16GB per trace :)
later rev and piano should have that fixed.
Also make sure you use the *latest* possible firmware on ServeRAID
cards. I finally got a good benchmarking and firmware analysis
system cooked up for them, but they've only been using it for the past
few months, so later versions have gotten much better. (overview at
http://sublogic.com/autotrace/ with visual explanation in the slide at
http://sublogic.com/autotrace/slides/sld002.htm)
Might wanna try later ips drivers if possible... it's still a fairly
new driver, and should be improving still.
> Size is MB, BlkSz is Bytes, Read and Write are MB/sec, Seeks are Seeks/sec
>
> Dir Size BlkSz Thr# Read (CPU%) Write (CPU%) Seeks (CPU%)
> ----- ------ ------- ---- ------------- -------------- --------------
> /usr/ 512 4096 1 11.3997 4.96% 6.99304 4.27% 149.242 0.77%
> /usr/ 512 4096 2 11.8671 5.47% 6.95879 4.25% 195.759 0.97%
> /usr/ 512 4096 4 12.2617 5.69% 6.94252 4.27% 223.820 1.14%
> /usr/ 512 4096 8 12.3979 5.78% 6.93575 4.29% 250.433 1.41%
> /usr/ 512 4096 16 12.3850 5.82% 6.93202 4.32% 277.247 1.44%
> /usr/ 512 4096 32 12.1949 5.82% 6.92113 4.34% 297.975 1.50%
> /usr/ 512 4096 64 11.7323 5.81% 6.87402 4.37% 314.251 1.59%
I hate the Write field... it's such a lie :) it's not "multi-threaded"
it's "single-threaded with (thread#-1) pauses"... ugh, that's going
to get changed.
James
