Dynamic multipathing support is available for Fibre Channel and iSCSI storage repositories. By default, multipathing uses round robin mode load balancing, so both routes will have active traffic on them during normal operation. You enable and disable storage multipathing in XenCenter via the Multipathing
tab on the server's Properties
Before you enable multipathing:
- Verify that multiple targets are available on your storage server.
- The server must be placed in Maintenance Mode; this ensures that any running virtual machines with virtual disks in the affected storage repository are migrated before the changes are made.
- Multipathing must be configured on each host in the pool. All cabling and, in the case of iSCSI, subnet configurations must match for the corresponding NICs on each host. (For example, all NIC 3s must be configured to use the same subnet. See Configuring IP Addresses for more information.)
For more in-depth multipathing information, see the Configuring iSCSI Multipathing Support for XenServer guide and the XenServer Administrator's Guide.