HP Serviceguard Version A.11.18 Release Notes, September 2008

Support for Veritas Volume Manager (VxVM)
Veritas (VxVM) 4.1 and 5.0 from Symantec are supported on HP-UX 11i v3, but VxVM
3.5 is not. If you are running VxVM 3.5 (as part of the Base Product included with
HP-UX), you can do a rolling upgrade to Serviceguard A.11.18 on HP-UX 11i v3 with
VxVM 4.1 or later. See “Upgrading from an Earlier Serviceguard Release” (page 75)
for more information. See also “Support for Veritas 5.0 on HP-UX 11i v2 and 11i v3”
(page 25).
NOTE: A file created with VxFS 5.0 cannot be opened by the 4.1 version.
Native Multipathing, Veritas DMP, and Related Features
The HP-UX 11i v3 I/O subsystem provides multipathing and load balancing by default.
This is often referred to as native multipathing.
Veritas Volume Manager (VxVM) version 4.1 and Dynamic Multipathing (DMP) from
Symantec are supported on HP-UX 11i v3, but do not provide multipathing and load
balancing; DMP acts as a pass-through driver, allowing multipathing and load balancing
to be controlled by the HP-UX I/O subsystem instead.
When you upgrade a system to HP-UX 11i v3, the I/O subsystem by default will start
performing load balancing and multipathing for all multipath devices (whether or not
they are managed by VxVM/DMP, and whether or not you decide to migrate the system
to agile addressing); you do not have to take any additional steps to make this happen.
For more information about multipathing in HP-UX 11i v3, see the white paper HP-UX
11i v3 Native Multipathing for Mass Storage, and the Logical Volume Management volume
of the HP-UX System Administrator’s Guide in the HP-UX 11i v3 Operating
Environments collection at http://docs.hp.com. See also “About Device Special
Files (DSFs)” (page 46).
PV Links
Previous editions of Managing Serviceguard recommended creating LVM PV links for
LUNs defined in disk arrays. On HP-UX 11i v3, these PV Links are redundant; they
are supported, but will be inactive unless you turn off native multipathing (in that case
they will function as they did in previous releases of HP-UX).
PCI Error Recovery
PCI Error Recovery enables an HP-UX system to detect, isolate, and automatically
recover from a PCI error. PCI Error Recovery is enabled on HP-UX 11i v3 systems by
default, but HP recommends that it remain enabled in a Serviceguard cluster only if
your storage devices are configured with multiple paths and you have not disabled
HP-UX native multipathing.
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