Managing Serviceguard 13th Edition, February 2007

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 125
1) dual (multiple) heartbeat networks
2) single heartbeat network with standby LAN card(s)
3) single heartbeat network with APA
CVM 3.5 supports only options 2 and 3. Options 1 and 2 are the
minimum recommended configurations for CVM 4.1.
Comparison of Volume Managers
The following table summarizes the advantages and disadvantages of
the volume managers.
Table 3-5 Pros and Cons of Volume Managers with Serviceguard
Product Advantages Tradeoffs
Logical Volume
Manager (LVM)
• Software is provided with all
versions of HP-UX.
• Provides up to 3-way mirroring
using optional Mirrordisk/UX
software.
• Dynamic multipathing (DMP) is
active by default as of HP-UX
11i v3.
• Supports exclusive activation as
well as read-only activation from
multiple nodes
• Can be used to configure a
cluster lock disk
• Supports multiple heartbeat
subnets; the one with the faster
failover time is used to re-form
the cluster.
• Lacks flexibility and
extended features of some
other volume managers
Mirrordisk/UX • Software mirroring
• Lower cost solution
• Lacks extended features of
other volume managers