[K12OSN] new server serial ATA or SCSI - results on new 3ware card
Chris Kacoroski
ckacoroski at nsd.org
Fri Feb 27 19:28:00 UTC 2004
Hi,
I got my new system with the following specs:
- 3ware controller #1 with (2) sata drives in mirrored config as system
disk
- 3ware controller #2 with (9) sata drives in raid 5 split into 2 912GB
partitions (sdb1 & sdb2)
- Redhat AS3 with all the patches (2.4.21-9.0.1.ELsmp kernel)
- Dual Xeon 2.4Ghz cpus with hyperthreading so they look like four
processors
and the results I get with hdparm -tT when run individually are:
/dev/sdb2:
Timing buffer-cache reads: 2440 MB in 2.00 seconds = 1220 MB/sec
Timing buffered disk reads: 132 MB in 3.01 seconds = 43.85 MB/sec
/dev/sdb1:
Timing buffer-cache reads: 2436 MB in 2.00 seconds = 1218 MB/sec
Timing buffered disk reads: 132 MB in 3.03 seconds = 43.56 MB/sec
/dev/vg00/lvRoot:
Timing buffer-cache reads: 2228 MB in 2.00 seconds = 1214 MB/sec
Timing buffered disk reads: 110 MB in 3.03 seconds = 36.30 MB/sec
when I run them at the same time, the results drop to:
/dev/sdb2:
Timing buffer-cache reads: 1760 MB in 2.00 seconds = 880 MB/sec
Timing buffered disk reads: 102 MB in 3.14 seconds = 31.19 MB/sec
/dev/sdb1:
Timing buffer-cache reads: 1780 MB in 2.00 seconds = 890 MB/sec
Timing buffered disk reads: 98 MB in 3.03 seconds = 32.34 MB/sec
/dev/vg00/lvRoot:
Timing buffer-cache reads: 1200 MB in 2.00 seconds = 600 MB/sec
Timing buffered disk reads: 108 MB in 3.00 seconds = 36.00 MB/sec
To me the interesting thing is that the system partition also slows
down even though it is on a separate 3ware card. I plan to do some
more extensive testing next week, but initially it looks like it will
keep up with a scsi based system.
--
"When we try to pick out anything by itself, we find it
connected to the entire universe" John Muir
Chris "Ski" Kacoroski, ckacoroski at nsd.org, 425-489-6263
On Feb 25, 2004, at 6:48 PM, Sudev Barar wrote:
More information about the K12OSN
mailing list