On Tue, Nov 24, 2009 at 08:07:12AM -0800, Chris K. wrote: > Hello, > I'm writing in regards to the performance with open-iscsi on a > 10gbe network. On your website you posted performance results > indicating you reached read and write speeds of 450 MegaBytes per > second. > > In our environment we use Myricom dual channel 10gbe network cards on > a gentoo linux system connected via fiber to a 10gbe interfaced SAN > with a raid 0 volume mounted with 4 15000rpm SAS drives. > Unfortunately, the maximum speed we are acheiving is 94 MB/s. We do > know that the network interfaces can stream data at 822MB/s (results > obtained with netperf). we know that local read performance on the > disks is 480MB/s. When using netcat or direct tcp/ip connection we get > speeds in this range, however when we connect a volume via the iscsi > protocol using the open-iscsi initiator we drop to 94MB/s(best result. > Obtained with bonnie++ and dd). >
What block size are you using with dd? Try: dd if=/dev/foo of=/dev/null bs=1024k count=32768 How's the CPU usage on both the target and the initiator when you run that? Is there iowait? Did you try with nullio LUN from the target? -- Pasi -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-is...@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?hl=en.