HP Serveur lame HP ProLiant BL465c Gen8 - Manual (Page 72)

• It might take a long time to execute the backup command for VSS backup, because the VSS import
server verifies the backup result database. The time required to verify the database depends on
factors such as the database capacity, the backup server's machine performance, and disk per-
formance. Also, an option can be specified in the
drmexgbackup or EX_DRM_EXG_BACKUP
command used for completing the backup operation without verifying the database. If you omit
the verification, HP recommends that you use the
drmexgverify or EX_DRM_EXG_VERIFY
command to verify the database before performing restoration or backing up data to tape.
Note that, although an option is provided for the
drmexgbackup or EX_DRM_EXG_BACKUP
command to delete transaction logs after backup without verification, if this option is used when
the database is corrupted, roll-forward recovery might not be able to be performed.
• The following are the files verified during database verification when backup is performed by using
VSS:
• Data files in the Information Store (
*.edb )
• Transaction log files that have not been committed (
*.log
)
• Note on approximate periods required for database verification when a backup is performed by
using VSS:
• For Exchange Server 2003, Application Agent uses the
ESEUTIL utility to verify databases.
The table below lists the approximate amount of time required to verify a database. Note that
the approximate amount listed in the table only apply under certain conditions, and are not a
guarantee product performance.
Table 4 Approximate amount required to verify Exchange Server 2003 database for backup
by using VSS
Amount of time
required for
database verifica-
tion
Number of transac-
tion log files
(
*.log )
Capacity of the
data file (
*.edb )
System configuration for the
database server
10 seconds 2 500 MB • CPU: Pentium 4 1.5 GHz
• Memory: 1 GB
• Storage system: XP128 35 seconds 2 2 GB
• The following table lists the approximate amount of time required to verify a database for Ex-
change Server 2007.
Table 5 Approximate amount required to verify Exchange Server 2007 database for backup
by using VSS
Amount of time
required for
database verifica-
tion
Number of transac-
tion log files
(
*.log )
Capacity of the
data file (
*.edb )
System configuration for the
backup server
3 hours 5 500 GB
• CPU: 3.0 GHz x 2
• Memory: 6 GB
• Storage system: HP
XP24000
Application Agent system configurations 72