HP XP20000/XP24000 Podręcznik administratora - Strona 16

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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

Overview of HP StorageWorks XP Virtualization Adapter

Figure