Veritas Volume Manager 5.0.1 Release Notes, HP-UX 11i v3, First Edition, November 2009

of time and consume considerable resources. To minimize the frequency of having to
perform a site reattachment operation, HP recommends that you use the vxdmpadm
settune command to configure a value smaller than 60 seconds for dmp_health_time,
and a value larger than 300 seconds for dmp_path_age.
— Domain controller mode in CVM clusters
The slave nodes in a CVM cluster only have access to I/O objects. If information related
to non-I/O (for example, volume tags) must be made available on a slave node, a
command must to be shipped to the Storage Agent on the master node for execution.
The results are then communicated back to the slave node.
The domain controller mode of VEA enables all nodes of a CVM cluster to be placed in
the same domain with a central authentication server. This enables commands to be
executed on any node within the domain if the executing process has sufficient
permissions.
If the domain controller mode is configured, information related to non-I/O is accessible
using VEA on any node in a CVM cluster. However, even if the domain controller mode
is enabled in a CVM cluster, ISP commands must be run on the master node. ISP
commands that are run on a slave node are not redirected to the Storage Agent on the
master node. Such commands fail if they require access to information related to non-I/O
that is unavailable on a slave node.
— Problem
When a volume under recovery is in the NEEDSYNC/SYNC state and vxtask list does
not show any active tasks.
Workaround
You must manually recover volumes in NEEDSYNC/SYNC state. On the master node,
use the following command to move volumes from NEEDSYNC/SYNC state to ACTIVE
state:
vxvol -g dg -f resync vol
— In certain cases, when the master node is rebooted, mirrored volumes detach and I/O
failures occur
If the VxVM disk group is configured on iSCSI devices and if the CVM master node is
rebooted (ungraceful shutdown) with I/Os in progress on the VxVM mirrored volumes
from the same node, the mirrored volumes are detached on all the slave nodes in the
cluster and I/O failures occur. This behavior occurs when the detach policy value is
configured as Global.
— Problem
Node join issues when the disk group is in a disabled state on the master node
In a CVM environment, a shared disk group gets into disabled state on the master node
when it loses connectivity with all the configuration and logs copies of the disk group.
The subsequent node joins fail.
Workarounds
You can use one of the following workarounds to correct this issue:
◦ To resolve the node join issues, complete the following steps:
1. Resolve the storage connectivity issue.
2. Stop I/Os on volumes in this disk group from all slave nodes.
3. Deport and re-import the shared disk group.
22 Veritas Volume Manager 5.0.1 Release Notes