Application Notes Usage and best practices for Device Mapper Multipath with Xen enabled virtual machines for HP StorageWorks Disk Arrays (5697-7828, April 2009)

Figure 6 Assigning storage space screen
7. Click Finish and the new storage device will be added to the virtual machine.
The mapped devices are presented to the guest operating system as a virtual block device.
Example: ~foo# cat /proc/partitions
major minor #blocks name
202 0 71652960 xvba
202 1 1052226 xvba1
202 2 5116702 xvba2
202 3 65480940 xvbb
iSCSI devices on virtual machines
iSCSI devices can be presented to the virtual machines directly. To create multipath devices for the
iSCSI disk in the virtual machines, blacklist the virtual block device in /etc/multipath.conf file
by adding the following in the blacklist section:
devnode “^xvd*”
NOTE:
Multipathing for FC and SAS devices are not supported on virtual machines.
Usage and best practices for Device Mapper Multipath with Xen enabled virtual machines for HP
StorageWorks Disk Arrays 11