VERITAS Volume Manager 4.1 Hardware Notes

Hardware Notes

DMP Coexistence with EMC PowerPath

Chapter 1 13

If each FC10 disk system is individually connected to the host (using separate HBAs), the

above mentioned feature functions correctly and as expected.

HP Surestore Disk Array FC60

Although the HP Surestore Disk Array FC60 can be used as an active/active disk array in

some conﬁgurations, with VERITAS Volume Manager for HP-UX it can only be used as an

active/passive disk array.

HP Surestore Disk Array XP48, XP256 and XP512

HP Surestore Disk Arrays XP48, XP256 and XP512 are supported with Dynamic

Multipathing (DMP) in active/active mode. If Base-VXVM encounters devices with identical

VxVM Disk IDs, the Base-VXVM software will give a preference to selecting the P-Vol as

opposed to the S-Vol to resolve the conﬂict. This disk selection policy works only for microcode

revisions 5244 and above.

DMP Coexistence with EMC PowerPath

With this release of Base-VXVM, DMP can coexist with PowerPath. Depending on the

scenario, you might need to install the EMC Cx600 ASL and its associated APM. To use DMP

with PowerPath, you should be aware of the following scenarios.

• If you are installing Base-VXVM 4.1 and PowerPath is installed, you do not need to install

the Cx600 ASL and its associated APM. The array must be conﬁgured in explicit fail-over

mode.

• If you are installing Base-VXVM 4.1 and PowerPath is not installed, you must install the

Cx600 ASL and its associated APM. The array can be in any mode.

The following table lists these scenarios and the required array modes:

Table 1-3 Scenarious and Required Array Modes

PowerPath DMP Array mode

Installed libvxemc.so handles EMC

arrays and DGC claiming

internally. PP handles fail-over.

No need to install C.x600 ASL or

Cx600 APM

Explicit fail-over