Gonçalo Borges wrote: > Hi All... > > Sorry, the following could be a little bit off topic... > > Does any one has an idea of what is the expected performance for a IBM > DS 3300 system connected via open iSCSI? Using a RAID 1 with 2 disks, > I got the following numbers: >
Is /apoio04/b1 a scsi/iscsi disk or is it LVM/DM/RAID on top of a iscsi/scsi disk? Could you set the IO scheduler to noop echo noop > /sys/block/sdX/queue/scheduler and see if that makes a difference. Also try bs=128k And then also run iscsiadm -m session -P 3 > Sequential Write: > > [r...@core12 ~]# dd if=/dev/zero of=/apoio04/b1 bs=64k count=125000 > 125000+0 records in > 125000+0 records out > 8192000000 bytes (8.2 GB) copied, 454.522 seconds, 18.0 MB/s > > Sequential Read: > [r...@core12 ~]# dd if=/apoio04/b1 of=/dev/null bs=64k count=125000 > 125000+0 records in > 125000+0 records out > 8192000000 bytes (8.2 GB) copied, 94.9401 seconds, 86.3 MB/s > > I restricted the RAM to be only 1GB, therefore there are no cache > effects in these numbers. Because the read stats are good, we exclude > network bottlenecks. Nevertheless, we were expecting more or less the > performance of a single disk (~50MB/s) for the write tests and we are > getting less than half. I do not know if this is really the physical > limit of the system or if there is a problem somewhere... > > I could not find any IBM official numbers, therefore, I though that > someone over here could give me any hint about the numbers they are > getting... > > Thanks in Advance > Cheers > Goncalo Borges > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
