Managing Serviceguard 14th Edition, June 2007

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3122
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
Shared Logical
Volume Manager
(SLVM)
• Provided free with SGeRAC for
multi-node access to RAC data
• Supports up to 16 nodes in
shared read/write mode for each
cluster
• Supports exclusive activation
• Supports multiple heartbeat
subnets.
• Online node configuration with
activated shared volume groups
(using specific SLVM kernel and
Serviceguard revisions)
• Lacks the flexibility and
extended features of some
other volume managers.
• Limited mirroring support