At 08:17 PM 7/26/2005, Chuck Swiger wrote:
...so it's not exactly super-zippy, either. Hmm, is it just me, or are the
following numbers significantly low for a RAID-1 of two 10K RPM U320 SCSI
disks...?
/dev/amrd1
512 # sectorsize
73274490880 # mediasize in bytes (68G)
143114240 # mediasize in sectors
8908 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 1.824059 sec = 7.296 msec
Half stroke: 250 iter in 1.805398 sec = 7.222 msec
Quarter stroke: 500 iter in 4.254147 sec = 8.508 msec
Short forward: 400 iter in 2.821081 sec = 7.053 msec
Short backward: 400 iter in 2.860203 sec = 7.151 msec
Seq outer: 2048 iter in 8.821875 sec = 4.308 msec
Seq inner: 2048 iter in 9.006505 sec = 4.398 msec
Transfer rates:
outside: 102400 kbytes in 9.242111 sec = 11080 kbytes/sec
middle: 102400 kbytes in 9.230325 sec = 11094 kbytes/sec
inside: 102400 kbytes in 10.779231 sec = 9500 kbytes/sec
[ This is running RELENG_5_4... ]
I would have expected the transfer rates to be about twice what they're
listed as here. Though I don't know how you measured them.
If you want to see something interesting, create a ufs1 file system on the
same raid 1 using FreeBSD 4.x. Then mount it in 5.x and do your test for
transfer rates. Compare that to either ufs1 or ufs2 on the same raid 1 as
created by 5.4.
The results are very interesting.
-Glenn
--
-Chuck
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