HP StorageWorks Application Recovery Manager Installation and Licensing Guide (T4395-96002, February 2008)

G-10
Glossary
without an operator. This implies that no
operator personnel is present to work
with the backup application.
Local Continuous Replication
(Microsoft Exchange Server specific
term)
Local continuous replication (LCR) is a
single-server solution that creates and
maintains an exact copy (LCR copy) of
a storage group. An LCR copy is located
on the same server as the original
storage group. When an LCR copy is
created, it is kept up to date through
change propagation (log replay)
technology. The replication feature in
LCR guarantees that logs that have not
been replicated are not deleted. The
implication of this behavior is that
running backups in a mode that deletes
logs may not actually free space if
replication is sufficiently far behind in
its log copying.
An LCR copy is used for disaster
recovery because you can switch to the
LCR copy in a few seconds. If an LCR
copy is used for backup and if it is
located on a different disk than the
original data, then the I/O load on a
production database is minimal.
A replicated storage group is
represented as a new instance of
Exchange writer called Exchange
Replication Service and can be backed
up (using VSS) as a normal storage
group.
See also Cluster Continuous
Replication and Exchange Replication
Service.
logging level
The logging level determines the
amount of details on files and directories
written to the IDB during backup. You
can always restore your data, regardless
of the logging level used during backup.
Application Recovery Manager provides
four logging levels: Log All, Log
Directories, Log Files, and No Log. The
different logging level settings influence
the IDB growth, backup speed, and the
convenience of browsing data for
restore.
logical-log files
This applies to online database backup.
Logical-log files are files in which
modified data is first stored before being
flushed to disk. In the event of a failure,
these logical-log files are used to roll
forward all transactions that have been
committed as well as roll back any
transactions that have not been
committed.
login ID (MS SQL Server specific term)
The name a user uses to log on to
Microsoft SQL Server. A login ID is
valid if Microsoft SQL Server has an
entry for that user in the system table
syslogin.