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
>> 14640
