Managing Serviceguard Fifteenth Edition, reprinted May 2008

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 125
Veritas Cluster
Volume
Manager—
B9117AA (CVM
3.5)
B9117BA (CVM
4.1)
B9117CA (CVM
5.0)
• Provides volume configuration
propagation.
• Supports cluster shareable disk
groups.
• Package startup time is faster
than with VxVM.
• Supports shared activation.
• Supports exclusive activation.
• Supports activation in different
modes on different nodes at the
same time
• CVM versions 4.1 and later
support the Veritas Cluster File
System (CFS)
• Disk groups must be
configured on a master node
• CVM can only be used with
up to 8 cluster nodes. CFS
can be used with up to 4
nodes.
• Cluster startup may be
slower than with VxVM
• Requires purchase of
additional license
• No support for striped
mirrors or RAID 5
• Version 3.5 supports only a
single heartbeat subnet
(Version 4.1 and later
support more than one
heartbeat)
• CVM requires all nodes to
have connectivity to the
shared disk groups
• Not currently supported on
all versions of HP-UX
Table 3-4 Pros and Cons of Volume Managers with Serviceguard
Product Advantages Tradeoffs