Try regenerating the array and put it in striped mode, rather than raid-5
redundant mode, and see what happens. You might also try setting it
up as a mirror raid-0/1 and test. I'm sure everyone here would be
interested
in the results, I know I would.
Ted
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Tamouh H.
Sent: Saturday, January 21, 2006 4:15 PM
To: freebsd-questions@freebsd.org
Subject: RE: slow RAID-5 on FreeBSD 5.4
On another note, I've ran diskinfo test and these are the
results, much better but still the RAID-5 slower than a single drive:
impala# diskinfo -t aacd1
aacd1
512 # sectorsize
146781044736# mediasize in bytes (137G)
286681728 # mediasize in sectors
17845 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 3.291258 sec = 13.165 msec
Half stroke: 250 iter in 2.362839 sec =9.451 msec
Quarter stroke: 500 iter in 3.908358 sec =7.817 msec
Short forward:400 iter in 2.478195 sec =6.195 msec
Short backward: 400 iter in 2.459182 sec =6.148 msec
Seq outer: 2048 iter in 0.661217 sec =0.323 msec
Seq inner: 2048 iter in 0.637923 sec =0.311 msec
Transfer rates:
outside: 102400 kbytes in 1.659174 sec =
61717 kbytes/sec
middle:102400 kbytes in 1.763043 sec =
58081 kbytes/sec
inside:102400 kbytes in 2.867523 sec =
35710 kbytes/sec
impala# diskinfo -t aacd0
aacd0
512 # sectorsize
293561434112# mediasize in bytes (273G)
573362176 # mediasize in sectors
35690 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 2.966840 sec = 11.867 msec
Half stroke: 250 iter in 2.270758 sec =9.083 msec
Quarter stroke: 500 iter in 4.493850 sec =8.988 msec
Short forward:400 iter in 2.681128 sec =6.703 msec
Short backward: 400 iter in 1.520458 sec =3.801 msec
Seq outer: 2048 iter in 0.631963 sec =0.309 msec
Seq inner: 2048 iter in 0.625584 sec =0.305 msec
Transfer rates:
outside: 102400 kbytes in 2.139737 sec =
47856 kbytes/sec
middle:102400 kbytes in 3.080063 sec =
33246 kbytes/sec
inside:102400 kbytes in 4.358889 sec =
23492 kbytes/sec
Hello,
I've just ran Bonnie on a FreeBSD 5.4 machine with Adaptec
2230SLP RAID-5 SCSI Card and Seagate 146GB 10K RPM U320 drives.
The results were very surprising. The RAID-5 is EXTREMELY
slow, and I can't figure out why!
The RAID controller has two volumes: RAID-5 and a lone drive.
This is Bonnie results from the lone drive on the Adaptec card:
impala# ./Bonnie -d /tmp
File '/tmp/Bonnie.30883', size: 104857600 Writing with
putc()...done Rewriting...done Writing intelligently...done
Reading with getc()...done Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
---Sequential Output ---Sequential
Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char-
--Block--- --Seeks---
MachineMB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
K/sec %CPU /sec %CPU
100 27168 28.2 31668 13.9 36530 10.8 83540 92.1
495217 98.5 26086.8 182.8
Here are the results doing the same test on the RAID-5:
impala# ./Bonnie -d /usr
File '/usr/Bonnie.30972', size: 104857600 Writing with
putc()...done Rewriting...done Writing intelligently...done
Reading with getc()...done Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
---Sequential Output ---Sequential
Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char-
--Block--- --Seeks---
MachineMB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
K/sec %CPU /sec %CPU
100 7478 7.7 10727 4.3 7250 3.2 101910 99.6
1464070 99.2 24067.2 180.6
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