Hi: I am running device mapper version 1.00.21 multipath-tools 0.4.3-pre6, kernel 2.6.11-rc3. I am getting the following errors when I run multipath -v2 create: 00001826001580CF [size=2 MB][features="0"][hwhandler="0"] \_ round-robin 0 [first] \_ 2:0:0:23 sdaa 65:160 [ready ] \_ 2:0:1:23 sday 67:32 [ready ] device-mapper ioctl cmd 9 failed: Invalid argument device-mapper ioctl cmd 14 failed: No such device or address I am able to do I/O to the device. These messages are found under lib/ioctl/libdm-iface.c Anything that I am missing? TIA, avinash