Managing Serviceguard Eighteenth Edition, September 2010

Table 3-4 Pros and Cons of Volume Managers with Serviceguard
TradeoffsAdvantagesProduct
• Lacks flexibility and extended
features of some other volume
managers
• 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.
Logical Volume
Manager (LVM)
• Lacks extended features of other
volume managers
• Software mirroring
• Lower cost solution
Mirrordisk/UX
• Lacks the flexibility and extended
features of some other volume
managers.
• Limited mirroring support
• 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)
Shared Logical
Volume Manager
(SLVM)
• Cannot be used for a cluster lock
• 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
• 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.
Base-VxVM
Volume Managers for Data Storage 115