Metrocluster with Continuous Access EVA P6000 for Linux Version B.01.00.00 Release Notes

Support for Enhanced Asynchronous Replication Mode
Metrocluster for Linux supports Enhanced Asynchronous write mode with P6000/EVA arrays. In
this mode, the host receives an I/O completion acknowledgement after the data is successfully
written to the disk based log/journal, which is used to queue the writes, which occurs after the
data is written to the local cache. The asynchronous replication process reads the I/O from the
journal and replicates it, using current methodologies, to destination P6000/EVA. This write mode
is suitable for the application which demands less response time. Metrocluster for Linux does not
support the Basic Asynchronous mode. The asynchronous replication process reads the I/O from
the journal and replicates it, using current methodologies, to destination P6000/EVA.
Support for Data Replication Storage Failover Preview
The cmdrprev command enables you to preview the preparation process for data replication in
a Metrocluster environment, and also helps you to identify potential problems in the data replication
environment that, if left undetected, may result in an unsuccessful Metrocluster failover.
For more information on using the cmdrprev command in your Metrocluster environment, see
Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access EVA
P6000 for Linux available at http://www.hp.com/go/linux-serviceguard-docs.
NOTE: You must install the Metrocluster Add-ons for Linux RPM to use the cmdrprev command.
Serviceguard Cluster and Package Configuration Via Serviceguard Manager or System Management
Homepage
Starting with HP Serviceguard Manager B.03.31.10 available in Serviceguard A.11.20.10, the
following Serviceguard Manager operations are supported in a Metrocluster environment:
• Configuration, monitoring and administration of Metrocluster modular packages.
However, the following restriction applies:
• A Metrocluster package configuration requires a system administrator to configure data
replication, which is not supported by Serviceguard Manager. This step is required to be
performed by the administrator outside of the HP Serviceguard Manager.
For more information, see HP Serviceguard A.11.20.10 for Linux Release Notes available at
http://www.hp.com/go/linux-serviceguard-docs and HP Serviceguard Manager B.03.31.10
online help system that is available with the product.
NOTE: Before you create any Metrocluster P6000 EVA package, a map file must be created
and distributed among the cluster nodes. This map file is created only from the command line using
evadiscovery and smispassword utilities. For more information, see Building Disaster Recovery
Serviceguard Solutions Using Metrocluster with Continuous Access EVA P6000 for Linux available
at http://www.hp.com/go/linux-serviceguard-docs.
Support for Serviceguard features
Support for Serviceguard A.11.20.xx
NOTE: A.11.20.xx refers to Serviceguard version A.11.20.00 or A.11.20.10.
Metrocluster for Linux supports HP Serviceguard version A.11.20.xx. All the HP Serviceguard
configuration restrictions are also applicable to Metrocluster. All the features available with
Serviceguard A.11.20.xx are supported in a Metrocluster configuration unless explicitly stated.
IMPORTANT: In a Metrocluster environment, the cmeval tool cannot be used to evaluate the
replication status and the changes to the Metrocluster package parameters.
What’s in this Version 5