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--- >> Machine MB 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--- >> Machine MB 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 > > >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to >"[EMAIL PROTECTED]" > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.375 / Virus Database: 267.14.21/235 - Release >Date: 1/19/2006 > _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
