In ESX 3.5 I use the command "esxcfg-mpath --policy=rr --lun=vmhba1:0:1" to set the round-robin multipathing policy.
But the esxcfg-mpath options have changed in ESX 4, so you can't set the policy anymore.
I have experimented with vimsh and found the following command: "vimsh hostsvc/storage/multipath_lun_setpolicy lunId policy prefer", but I have difficulties with the syntax.
I tried "vimsh hostsvc/storage/multipath_lun_setpolicy vmhba1:0:1 VMW_PSP_RR 0", but vimsh keeps telling me that "The object or item referred to could not be found".
So, does anybody know a command to set (round-robin) multipathing policies in the ESX 4 COS?