Managing Serviceguard Fifteenth Edition, reprinted May 2008

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 123
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
Base-VxVM • Software is supplied free with
HP-UX 11i releases.
• Java-based administration
through graphical user
interface.
• Striping (RAID-0) support.
• Concatenation.
• Online resizing of volumes.
• Supports multiple heartbeat
subnets.
• Cannot be used for a cluster
lock
• root/boot disk supported
only on VxVM 3.5 or later,
on HP-UX 11i
• Supports only exclusive
read or write activation
• Package delays are possible,
due to lengthy vxdg import
at the time the package is
started or failed over
Table 3-4 Pros and Cons of Volume Managers with Serviceguard
Product Advantages Tradeoffs