Multipathing in VMware
Posted on 2010-03-25
I have two DL180 servers set up with VMware and the HP Lefthand P4000 VSAN. I have everything working but could use some help with multipathing. I created two iSCSI VMKernels with different NICs assigned to each. The iSCSI adapter is showing both paths to the storage. One path says Active I/O and the other says just Active. I read that to push data down both paths you have to set the iSCSI LUN Path selection to Round Robin (currently it is set to Fixed (VMware). If I set it to Round Robin on both the ESX hosts and start to do any data transfer to the VSAN iSCSI LUN, I get I/O errors because the LUN goes offline. If I leave it as is on Fixed, it works fine but doesn't seem to be using both NICs simultaneously.
Any idea why? I must have missed something but not sure what.