HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96078, February 2008)

B - 1
B X Glossary
Glossary
Alerts—Notifications, warnings and errors that describe Storage Mirroring processes.
Auto-disconnect—When the Storage Mirroring queue has reached its maximum, the auto-disconnect process empties the
source queue and the source/target connection is broken.
Auto-reconnect—The process that automatically reestablishes any source/target connections that were active before a
Storage Mirroring failure on the source machine.
Auto-remirror—If a source or target machine fails, auto-remirror automatically initiates the mirroring process after the
target machine is back online or an auto-reconnect has occurred.
Block Checksum Comparison—Formula applied to two blocks of data to determine if the binary make-up of the blocks are
identical. Also called a checksum comparison.
Connection—The link between a source replication set and a target machine. This is a logical connection that refers to the
relationship between the replication set on the source and the copy of the data on the target, as well as the status of the
connection.
Connection ID—A unique ID associated with each Storage Mirroring connection.
Failover Timeout—The amount of time before failover begins. The time is calculated by multiplying the values of the monitor
interval and missed packets settings, and is displayed in the Failover Control Center.
File Change—The creation, modification, or deletion of a file. Also called a file request or operation.
LogViewer—The Storage Mirroring logging utility that logs processing notifications, warnings, and errors. The logs are viewed
with the LogViewer.
Mirror—Mirroring is the process of transmitting data contained in a replication set from the source to the target machine so
that an identical copy of data exists on the target machine.
Missed Packets—The configurable setting that specifies how many monitor replies can be missed before assuming a source
machine has failed.
Monitored IP Address—Those IP addresses on a source that have been selected to be monitored for failure by a Storage
Mirroring target.
Monitor Interval—The configurable failover setting that specifies how often the monitor request is sent to a source machine.
Monitor Reply—The acknowledgement that a source sends to a target indicating that it is still online.
Monitor Request—An inquiry sent from a target to a source to determine if the source is still online.
One-to-One Configuration—Configuration used when one target machine is dedicated to support one source machine for
mirror and replication data.
One-to-One Connection—Mirror and replication data are copied to the same volume and directory structure on a target as
they exist on a source. For example, c:\data and d:\files on the source are copied to c:\data and d:\files,
respectively, on the target.
Queue—A first-in, first-out pool of operations on the source waiting to be transmitted to a target, or a first-in, first-out pool
of operations waiting to be written to disk on the target.
Recursion—The process of automatically applying a replication set rule to the subdirectories of the named directory.
Remirror—Repeating a mirror process to guarantee the integrity of the data on the target.
Replication—The real-time transmission of file changes.
Replication Set—The data on a source machine that is to be protected by Storage Mirroring. Replication sets are defined by
the volumes, directories, files, or wild card combinations that are to be replicated to the target.
Replication Set Rule—One volume, directory, file, or wild card specification that is to be replicated to the target. One or
more replication set rules form a replication set.
Source—The machine that contains the original mission-critical data that must be protected.
Synchronize—The mirror process that copies the replication set data from the source to the target.
Target—The machine that maintains the copy of the replication set from the source.
Unmonitored IP Addresses—On a machine with multiple IP addresses, Storage Mirroring will not monitor for failure the IP
addresses that are not selected, but the target can assume these addresses during failover, if configured.
Verification—The process of confirming that the Storage Mirroring data on the target is identical to the replication set data
on the source.