Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access for P9000 and XP A.11.00

disaster recovery The process of restoring access to applications and data after a disaster. Disaster recovery can
be manual, meaning human intervention is required, or it can be automated, requiring little or
no human intervention.
disaster recovery
services
Services and products offered by companies that provide the hardware, software, processes,
and people necessary to recover from a disaster.
disaster tolerant The characteristic of being able to recover quickly from a disaster. Components of disaster
tolerance include redundant hardware, data replication, geographic dispersion, partial or complete
recovery automation, and well-defined recovery procedures.
disaster tolerant
architecture
A cluster architecture that protects against multiple points of failure or a single catastrophic failure
that affects many components by locating parts of the cluster at a remote site and by providing
data replication to the remote site. Other components of disaster tolerant architecture include
redundant links, either for networking or data replication, that are installed along different routes,
and automation of most or all of the recovery process.
E, F
Environment File Metrocluster uses a configuration file that includes variables that define the environment for the
Metrocluster to operate in a Serviceguard cluster. This configuration file is referred to as the
Metrocluster environment file. This file needs to be available on all nodes in the cluster for
Metrocluster to function successfully.
ESCON Enterprise Storage Connect. A type of fiber-optic channel used for inter-frame communication
between EMC Symmetrix frames using EMC SRDF or between HP Storage E P9000 or XP series
disk array units using Continuous Access P9000 or XP.
failover The transfer of control of an application or service from one node to another node after a failure.
Failover can be manual, requiring human intervention, or automated, requiring little or no human
intervention.
G - I
high availability A combination of technology, processes, and support partnerships that provide greater application
or system availability.
J, K, L
local cluster A cluster located in a single data center. This type of cluster is not disaster tolerant.
local failover Failover on the same node; this most often applied to hardware failover, For Example local LAN
failover is switching to the secondary LAN card on the same node after the primary LAN card
has failed.
logical data
replication
A type of on-line data replication that replicates logical transactions that change either the
filesystem or the database. Complex transactions might result in the modification of many diverse
physical blocks on the disk.
M
Maintenance mode A recovery group is in the maintenance mode when it is disabled. The cmrecovercl
-dcommand moves a recovery group is moved into maintenance mode. The cmrecovercl -e
command moved the recovery group out of the maintenance mode. When a recovery group is
in the maintenance mode, recovery is not allowed.
Metrocluster A Hewlett-Packard product that allows a customer to configure an Serviceguard cluster as a
disaster tolerant metropolitan cluster.
Metrocluster
Environment File
Metrocluster uses a configuration file that includes variables that define the environment for the
Metrocluster to operate in a Serviceguard cluster. This configuration file is referred to as the
Metrocluster environment file. This file needs to be available on all nodes in the cluster for
Metrocluster to function successfully.
mirrored data Data that is copied using mirroring.
mirroring Disk mirroring hardware or software, such as MirrorDisk/UX. Some mirroring methods might
allow splitting and merging.
224 Glossary