Multi Path I/O Connection - HP StorageWorks XP10000 - Disk Array Administrator's Manual

The device identification must include NAA version 6 information in Page 83 SCSI.
Protection groups using XP Continuous Access Synchronous or XP Continuous
Access Synchronous CTG
If the disk pairs for a protection group are XP Continuous Access Synchronous, use a fence level of
DATA. If the fence level of NEVER is used, the internal horctakeover command will fail (horctakeover
will return EX_VOLCUR). A fence level of NEVER cannot guarantee data consistency among all disks
in a device group when a single disk fails (because I/O is not fenced).
Virtual machines must be able to boot when a disaster occurs (failover), or when a failover test is
executed. When a disaster happens, it is acceptable to use fence level NEVER. Therefore, XP
Virtualization Adapter will failover successfully, but horctakeover will return an EX_VOLCUR error.
Fence level NEVER can be used under the following conditions:
It must be considered that will be out of starting APP(SQL/Exchange/Oracle/..)
The SRA does not swap from SVOL to PVOL when the XP Continuous Access link is active. Instead
the failover succeeds and SRM notified that all target volumes have changed to the SVOL SSWS
state.
Protection groups and CT groups using XP Continuous Access Asynchronous
and XP Continuous Access Journal Software
If the PVOLs for protection groups are CT group volumes using XP Continuous Access Asynchronous
or XP Continuous Access Journal Software, you need to split all volumes (LUNs) associated with the
protection groups to ensure the PVOLs of the protection groups are identical to the CT group.
MPIO (Multi Path I/O Connection) Connection
In a Multi-Path IO (MPIO) connection, SRM needs to discover both target port WWN recognizing an
ESX Server in discovery phase. XP Virtualization Adapter converts from a target port number in
horcm.conf to a target port WWN. Therefore XP Virtualization Adapter needs to include the
alternate path port and LUN number as shown
This example assumes that a target volume is connected to CL3-G and CL4-G for MPIO.
Figure 9 Multi Path I/O Connection
.
16 Overview of HP StorageWorks XP Virtualization Adapter
Figure 9.