VERITAS Volume Manager 3.1 for HP-UX Release Notes

Compatibility Information and Installation Requirements

Chapter 110

disk array in some conﬁgurations, with VERITAS Volume Manager for

HP-UX it can only be used as an active/passive disk array.

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

B9116AA, the VERITAS Volume Manager 3.1 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 HP FC10 Disk System Support

Because of the way LUNs are distributed across controllers by HP-UX, the enable/disable

controller feature of VxVM does not function as expected for the following conﬁgurations of

FC10 disk systems:

• multiple daisy chained FC10 disk systems connected to a single host

• multiple FC10 disk systems connected to a single host through a hub

If the vxdmpadm disable ctlr=

ctlr_name

command is used for the above conﬁgurations to

disable IOs through a particular controller, IOs can be stopped through paths that were not

intended by the user.

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

above mentioned feature functions correctly and as expected.

DMP and JBOD Support

The Dynamic Multipathing feature on JBOD drives works only if the individual disks provide

unique serial number information. If the individual disks do not provide unique serial