Managing Serviceguard 12th Edition, March 2006

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 123
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 free with HP-UX 11i
and later.
• Java-based administration
through graphical user
interface.
• Striping (RAID-0) support.
• Concatenation.
• Online resizing of volumes.
• Supports multiple heartbeat
subnets.
• Supports up to 16 nodes
• Cannot be used for a cluster
lock.
• Using the disk as a
root/boot disk is only
supported for VxVM 3.5 or
later, when installed on
HP-UX 11.11.
• 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 3-5 Pros and Cons of Volume Managers with Serviceguard
Product Advantages Tradeoffs