Managing Serviceguard Sixteenth Edition, March 2009

Table 3-4 Pros and Cons of Volume Managers with Serviceguard (continued)
TradeoffsAdvantagesProduct
• 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
• 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
• Requires purchase of additional
license
• 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 11i.
• Does not support activation on
multiple nodes in either shared
mode or read-only mode
• May cause delay at package
startup time due to lengthy vxdg
import
• Disk group configuration from any
node.
• DMP for active/active storage devices.
• Supports exclusive activation.
• Hot relocation and unrelocation of failed
subdisks
• Supports up to 32 plexes per volume
• RAID 1+0 mirrored stripes
• RAID 1 mirroring
• RAID 5
• RAID 0+1 striped mirrors
• Supports multiple heartbeat subnets,
which could reduce cluster reformation
time.
Veritas Volume
Manager— Full
VxVM product
• Disk groups must be configured
on a master node
• CVM can only be used with up to
8 cluster nodes. CFS can be used
with up to 4 nodes.
• Cluster startup may be slower than
with VxVM
• Requires purchase of additional
license
• No support for striped mirrors or
RAID 5
• Version 3.5 supports only a single
heartbeat subnet (Version 4.1 and
later support more than one
heartbeat)
• CVM requires all nodes to have
connectivity to the shared disk
groups
• Not currently supported on all
versions of HP-UX
• Provides volume configuration
propagation.
• Supports cluster shareable disk groups.
• Package startup time is faster than with
VxVM.
• Supports shared activation.
• Supports exclusive activation.
• Supports activation in different modes
on different nodes at the same time
• CVM versions 4.1 and later support the
Veritas Cluster File System (CFS)
Veritas Cluster
Volume Manager
Volume Managers for Data Storage 117