Enterprise Volume Manager (Multi-OS) Host Agent Version 2.0D for HP Tru64 UNIX Release Notes

Limitations and Known Issues
9Release Notes – Enterprise Volume Manager (Multi-OS) Host Agent Version 2.0D
for HP Tru64 UNIX
Unit Style Replication Not Supported with AdvFS Domains
The CLONE operation provides two syntax styles:
• Unit syntax—replication sources are specified in terms of the applicable storage
system and unit number. This method does not provide any mechanism for
quiescing an AdvFS domain or gathering the meta data necessary to reconstruct a
domain on the mount-on host.
Unit style replication is suitable only for UFS or raw devices, and is not supported
with AdvFS.
• Volume syntax—replication sources are specified in terms of the host on which
they reside and the applicable fileset or domain name. This method allows EVM
to quiesce the AdvFS domain being replicated and also allows EVM to gather the
metadata necessary to reconstruct the replicated domain on the mount-on host.
Mounting Multiple Filesets per AdvFS Domain
An EVM job automatically mounts only the fileset specified during job creation. A
limitation in the EVM job creation interface prevents more than one fileset from being
specified. In many cases, mounting more than one fileset per AdvFS domain is
desirable. In these cases, HP recommends adding a LAUNCH operation in the EVM
job immediately following the MOUNT operation. Use the LAUNCH operation to
execute a simple shell script on the mount-on host to mount any additional filesets as
desired.
International Language Support
To use EVM host agents with UNIX operating systems in non-English environments,
set “LANG=C; export LANG” in the root profile.
Known Issues
The EVM server periodically performs a “query” operation on each EVM host agent
to update the list of devices and volumes available on each host. The data returned by
this query contains a large amount of information about the physical and logical
structure of the AdvFS domains on the host. For very large configurations, the amount
of data returned may exceed the capacity of the buffer used to transmit the data to the
EVM server. If this occurs, the initial host login or subsequent job executions fail with
a “Pipe read error.”