Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 13, Administering Cluster Functionality
Administering VxVM in Cluster Environments
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To display information about one specific disk group, use the following command:
# vxdg list diskgroup
The following is example output for the command vxdg list group1 on the master:
Group: group1
dgid: 774222028.1090.teal
import-id: 32768.1749
flags: shared
version: 120
alignment: 8192 (bytes)
ssb: on
local-activation: exclusive-write
cluster-actv-modes: node0=ew node1=off
detach-policy: local
private_region_failure: leave
copies: nconfig=2 nlog=2
config: seqno=0.1976 permlen=1456 free=1448 templen=6 loglen=220
config disk c1t0d0 copy 1 len=1456 state=clean online
config disk c1t0d0 copy 1 len=1456 state=clean online
log disk c1t0d0 copy 1 len=220
log disk c1t0d0 copy 1 len=220
Note that the flags field is set to shared. The output for the same command when run
on a slave is slightly different. The local-activation and cluster-actv-modes
fields display the activation mode for this node and for each node in the cluster
respectively. The detach-policy and private_region_failure fields indicate how
the cluster behaves in the event of loss of connectivity to the disks, and to the
configuration and log copies on the disks.
Creating a Shared Disk Group
Note Shared disk groups can only be created on the master node.
If the cluster software has been run to set up the cluster, a shared disk group can be
created using the following command:
# vxdg -s init diskgroup [diskname=]devicename
where diskgroup is the disk group name, diskname is the administrative name chosen for
a VM disk, and devicename is the device name (or disk access name).
Caution The operating system cannot tell if a disk is shared. To protect data integrity
when dealing with disks that can be accessed by multiple systems, use the
correct designation when adding a disk to a disk group. VxVM allows you to
add a disk that is not physically shared to a shared disk group if the node where