Managing Serviceguard 12th Edition, March 2006

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 125
VERITAS
Cluster Volume
Manager—
B9117AA (CVM
3.5)
B9117BA (CVM
4.1)
• 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 version 4.1 supports 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 supports more
than one heartbeat)
• CVM requires all nodes to
have connectivity to the
shared disk groups.
Table 3-5 Pros and Cons of Volume Managers with Serviceguard
Product Advantages Tradeoffs