VERITAS Volume Manager 4.1 Release Notes (5900-0591, March 2010)

VERITAS Volume Manager 4.1 Release Notes
Known Problems and Workarounds
Chapter 130
DMP and HP Surestore Disk Array xp256
HP Surestore Disk Arrays xp256, xp512, and xp48 are supported with Dynamic Multipathing
(DMP) in active/active mode. If Base-VXVM encounters devices with identical Base-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 xp256 microcode
revisions 5244 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:
• EMC Symmetrix users must 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
— 5265 or 5266 for Sym-4.8 on models 3630, 3830, and 3930
— 5566 for Sym-5 on models 8130, 8430, and 8730
• The Common Serial Number Mode should be enabled for all channels that participate in
the DMP. This is done at installation time in the Symmetrix configuration by the EMC
Customer Engineer.
• Ultra SCSI and fast-wide differential (FWD) SCSI support has been tested on the EMC
OSD (Open System Director) controller.
See your sales representative for further updates on hardware support.
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 Base-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