HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

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.
• 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://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 158), 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:
• Configure networking and security (cmpreparecl)
• Create and start the cluster with a cluster lock device (cmdeploycl)
• Create or modify Logical volume groups and VxVM/CVM disk groups and import volume
groups or disk groups as additional shared storage for use by cluster packages
(cmpreparestg)
Cluster Configuration Planning 105