Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3118
VERITAS
Volume
Manager—
B9116AA
(VxVM)
• Disk group configuration from
any node
• Enhanced set of volume
management features, including
software mirroring, RAID 0/1,
RAID 5, and dynamic
multi-pathing for active/active
storage devices
• Cluster startup time is faster
than with CVM.
• Supports up to 16 nodes per
cluster
• Supports multiple heartbeat
subnets
• Does not support activation
on multiple nodes in either
shared mode or read-only
mode
• May cause delay at package
startup time due to lengthy
vxdg import
• Enhanced features require
purchase of additional
license
• Cannot be used as a cluster
lock device
VERITAS
Cluster Volume
Manager—
B9117AA (CVM)
• Enhanced set of volume
management features, including
software mirroring and RAID
0/1
• Package startup time is faster
than with VxVM
• Supports exclusive activation
• Supports activation in different
modes on different nodes at the
same time
• Disk groups must be
configured on a master node
• Can only be used with up to
4 cluster nodes
• Cluster startup may be
slower than with VxVM
• Requires purchase of
additional license
• No support for striped
mirrors or RAID 5
• Supports only a single
heartbeat subnet
Table 3-5 Pros and Cons of Volume Managers with Serviceguard
Product Pros Cons