Re: poor performances with Intel Raid Controller (iir)
On Friday 27 February 2009 04:14:49 Julien Cigar wrote: > Hello, > > I've a machine with an integrated Intel RAID controller (U320) which > uses the iir driver. I have two arrays, one RAID 1 with two disks and > one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system > is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or > RAM. > > I have very poor performances, around ~50 MB/s, is it normal ? > > jci...@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100 > 100+0 records in > 100+0 records out > 1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec) > > Are there any tool to detect what could be the bottleneck(s) ? dmesg to see if there's any indication about speeds. camcontrol inquiry bus:lun to get capabilities, including transfer rate gstat to see I/O transactions. You might not be able to see past the RAID controller, to rule out the actual disks. Also, bs > 2M usually degrades performance, start with 1M and go up. -- Mel Problem with today's modular software: they start with the modules and never get to the software part. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: poor performances with Intel Raid Controller (iir)
On Fri, 2009-02-27 at 15:37 +0100, Wojciech Puchar wrote: > > > > I've a machine with an integrated Intel RAID controller (U320) which > > uses the iir driver. I have two arrays, one RAID 1 with two disks and > > one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system > > is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or > > RAM. > > > > I have very poor performances, around ~50 MB/s, is it normal ? > > > > jci...@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100 > > 100+0 records in > > 100+0 records out > > 1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec) > > > > Are there any tool to detect what could be the bottleneck(s) ? > > are you sure it isn't NORMAL performance of this card. > Not sure, I admit that the card is quite old (4 years), but 50 MB/s seems really slow to me (especially for U320 SCSI) .. > i think it is, the "hardware" RAID solutions are usually much slower than > software, even more with RAID5. I tend to use software RAID too (at least on system with multiple processors)... when I have choice. -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: jci...@ulb.ac.be @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: poor performances with Intel Raid Controller (iir)
On Fri, 2009-02-27 at 16:07 +0100, Wojciech Puchar wrote: > > > > Not sure, I admit that the card is quite old (4 years), but 50 MB/s > > seems really slow to me (especially for U320 SCSI) .. > > U320 means interface speed, not disk speed. > yes, but the disks are 10k RPM U320 too .. for the price they cost (~500 € per unit I think) I expect to have a bit more than 50 MB/s .. -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: jci...@ulb.ac.be @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: poor performances with Intel Raid Controller (iir)
Not sure, I admit that the card is quite old (4 years), but 50 MB/s seems really slow to me (especially for U320 SCSI) .. U320 means interface speed, not disk speed. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: poor performances with Intel Raid Controller (iir)
I've a machine with an integrated Intel RAID controller (U320) which uses the iir driver. I have two arrays, one RAID 1 with two disks and one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or RAM. I have very poor performances, around ~50 MB/s, is it normal ? jci...@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100 100+0 records in 100+0 records out 1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec) Are there any tool to detect what could be the bottleneck(s) ? are you sure it isn't NORMAL performance of this card. i think it is, the "hardware" RAID solutions are usually much slower than software, even more with RAID5. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
poor performances with Intel Raid Controller (iir)
Hello, I've a machine with an integrated Intel RAID controller (U320) which uses the iir driver. I have two arrays, one RAID 1 with two disks and one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or RAM. I have very poor performances, around ~50 MB/s, is it normal ? jci...@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100 100+0 records in 100+0 records out 1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec) Are there any tool to detect what could be the bottleneck(s) ? Thanks, Julien -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: jci...@ulb.ac.be @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
