I have been struggling for few days with iSCSI and thought I could get some help on the forum...
fresh install of AIX7.1 TL4 on Power 710, The rootvg relies on 3 SAS disks in RAID 0, 32GB Memory
The lpar Profile is using all of the managed system's resources.
I have connected only 1 physical gigabit ports on the AIX box to my iscsi target server (RHEL6 with tgt iscsi)
The network seems ok, a ftp transfer between AIX & RHEL6 is 125Mb/s
However the iSCSI transfer has really poor performance : if I do a "dd if=/dev/hdisk1 of=/dev/null" from my AIX box (on the iscsi lun), I only get 1.5Mb/s !
(Please note that initially, I wanted to setup one LPAR as iscsi target, and one lpar as iscsi initiator, both using virtual ethernet adapter, and I got the same performance 1.5Mb/s between the 2 AIX lpar ... Then I decided to investigate further and to setup the whole system as a iSCSI initiator and using one of my RHEL6 iscsi target that I know works well.)
I also tried to setup the AIX as iSCSI target and the RHEL6 as initiator, the performance gets better 8MB/s but still not acceptable, I would at least expect 30-40MB/s
-Thanks for your answer, I understand that jumbo frames can increase performance, but still with normal frames I should be able to have at least 20-30MB/s
-I don't understand the relation with FC adapter, since iSCSI is over the network, and my disks are local disks (3 SAS disks in RAID0)
-I will investigate the I/O system settings...
I have 4 gigabit Ethernet adapters, the embedded ones that come with the P710.
I am using only one of them. as I said I am able to ftp at 125MB/s from RHEL6 to AIX, same network,same card, just the iscsi protocol seems to have bottleneck somewhere...
the CPU activity is almost 99% idle. I have plenty of RAM.
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