VERITAS Volume Manager 3.2 for HP-UX Release Notes

Compatibility Information and Installation Requirements

Chapter 132

• EMC Symmetrix (DMP active/active)

• High Availability Storage System (HASS) A3311A/12A (no DMP support)

• HP SureStore Disk Array 12H (DMP active/active)

• HP High Availability Fibre Channel Disk Array Model 30/FC (DMP active/passive)

• HP High Availability SCSI Disk Array Model 20 (DMP active/passive)

NOTE In order to configure DMP with active/active peripherals, you must have

B9116AA, the VERITAS Volume Manager 3.2 for HP-UX, installed. Without

B9116AA, you cannot set up DMP and can only configure a single path from the

host to an active/active peripheral. Active/active peripherals cannot be

configured as active/passive.

DMP and HP Surestore Disk Arrays xp256, xp512, and xp48

HP Surestore Disk Arrays xp256, xp512, and xp48 are supported with Dynamic Multipathing

(DMP) in active/active mode. If VxVM encounters devices with identical VxVM Disk IDs, the

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 will work only for the following microcode revisions:

xp256 microcode revisions 5244 and above

xp512 microcode revisions 1122 and above

xp48 microcode revisions 1122 and above

DMP and EMC Symmetrix Disk Array Support

The Dynamic Multipathing feature (DMP) of the Volume Manager works with the EMC

Symmetrix disk array only if the disk array is configured in the Common Serial Number

Mode. This is because only the Common Serial Number Mode configuration provides unique

device identification on different paths for DMP to configure its database. Without this mode,

DMP cannot provide the multipathing functionality. DMP cannot access EMC Symmetrix

disks as individual disks with a single path it found by scanning the device information tree

in the kernel.

For the DMP functionality to work with the EMC Symmetrix disk array, the following

conditions must be met:

• It is necessary that the EMC Symmetrix users program their disk arrays in the Common

Serial Number Mode before installing the Volume Manager package.

• The minimum level of microcode on the EMC Symmetrix should be:

— 5265 or 5266 for Sym-4 on models 3330, 3430, and 3700