Managing Serviceguard Fifteenth Edition, reprinted May 2008

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3122
Heartbeat configurations are configured differently depending on
whether you are using CVM 3.5, or 4.1 and later. You can create
redundancy in the following ways:
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 and later.
Comparison of Volume Managers
The following table summarizes the advantages and disadvantages of
the volume managers.
Table 3-4 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