Managing Serviceguard Eighteenth Edition, September 2010

NOTE: Software that assumes DSFs reside only in /dev/disk and /dev/rdisk
will not find cDSFs and may not work properly as a result; as of the date of this manual,
this was true of the Veritas Volume Manager, VxVM.
Limitations of cDSFs
• cDSFs are supported only within a single cluster; you cannot define a cDSF group
that crosses cluster boundaries.
• A node can belong to only one cDSF group.
• cDSFs are not supported by VxVM, CVM, CFS, or any other application that
assumes DSFs reside only in /dev/disk and /dev/rdisk.
• Oracle ASM cannot detect cDSFs created after ASM is installed.
• cDSFs do not support disk partitions.
Such partitions can be addressed by a device file using the agile addressing scheme,
but not by a cDSF.
LVM Commands and cDSFs
Some HP-UX commands have new options and behavior to support cDSFs, specifically:
• vgimport –C causes vgimport (1m) to use cDSFs.
• vgscan –C causes vgscan (1m) to display cDSFs
See the manpages for more information.
The following new HP-UX commands handle cDSFs specifically:
• vgcdsf(1m) converts all persistent DSFs in a volume group to cDSFs.
Legacy DSFs in the volume group will not be converted, but you can use HP-UX
the vgdsf script to convert these legacy DSFs to persistent DSFs if you need to.
For more information on the vgdsf script, see the white paper LVM Migration
from Legacy to Agile Naming Model at http://www.hp.com/go/hpux-core-docs.
For more information on vgcdsf, see the manpage.
• io_cdsf_config (1m) displays information about cDSFs.
See the manpage for more information.
About Easy Deployment
In the past you had two main choices for configuring a cluster: using Serviceguard
commands, as described in detail in Chapter 5 (page 205), or using the Serviceguard
Manager GUI (or some combination of these two methods). As of Serviceguard A.11.20,
there is a third option, called Easy Deployment.
The Easy Deployment tool consists of three commands: cmpreparecl (1m),
cmdeploycl (1m), and cmpreparestg (1m). These commands allow you to get
a cluster up and running in the minimum amount of time. The commands:
Cluster Configuration Planning 137