HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)
Glossary
This glossary defines terms used in this guide or related to this product and is not a comprehensive
glossary of computer terms.
array See virtual array and storage system.
asynchronous A descriptive term for computing models that elimina te timing de pendencies
between sequential processes. In asynchronous replication, the array controller
acknowledges that data has been written at the source before the data is
copied at the destination. Asynchronous replication is an optional DR group
property. See also synchronous.
bidirectional A descriptive term for an array that contains both source and destination virtual
disks. This configuration allows multidirectional I/O flow among several arrays.
copy set A source-destination pair of virtual disks.
crash consistency A point-in-time view of data as if the server just crashed. Server cache is lost
but stored data is recoverable.
default disk group The disk group that is created when an array is initialized. The minimum
number of disks the group can contain is eight. The maximum is the number
of installed disks.
destination The targeted recipient (for example, a DR group, array, virtual disk) of replica
ted
data. See also source.
disk group A named group of disks selected from all the available disks in an array. One
or more virtual disks can be created from a disk group.
DR group Data replication group. A named group of virtual disks selected from one
or more disk groups so that they replicate to the same destination, fail over
together, and preserve write order within the g roup.
dual fabric Two i ndependent fabrics providing multipath connections between Fibre
Channel end devices.
EV A Enterprise Virtual Array, an HP StorageWorks storage array.
event A system-generated status message, resulting from a:
• User-initiated action (for example, "suspend DR group")
• Replication or system transaction (for example, "retrieved data for storage
system")
• Job operation (for example, "job complete")
fabric A network of Fibre Channel switches or hubs and other devices.
failover An op eration that reverses replication direction so that the destination becomes
the source and the source becom es the destination. Failovers c an be planned
or unplanned and can occur between DR groups, managed sets, fabrics or
paths, and array controllers.
failsafe A descriptive term for devices that automatically assume a safe condition after
a malfunction. Failsafe DR groups stop accepting host input and stop logging
write history if a member of the group becomes unreachable.
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