HP Storage Mirroring V5 Software - Manual (Page 61)

HP StorageWorks Storage Mirroring Application Manager user’s guide 51
NOTE: All the database filenames (
*.mdf
,
*.ldf
, and
*.ndf
) must either be:
• Uniquely named (for example,
accounting1.mdf
and
accounting2.mdf
), or
• Uniquely located on the target (for example,
c:\Source3\accounting1\accounting1.mdf
and
c:\Source4\accounting2\accounting2.mdf
)
Mirror type
The following options specify what files you want sent from the source to the target during a mirror:
• Full —Copies all of the directories and files in the replication set to the target machine. If a mirror has
already been completed, another full mirror will overwrite the data on the target.
• Checksum — (Default) This option compares the date, time, and size, and for those files that are different, a
checksum calculation comparison is performed. A checksum calculation is a formula applied to blocks of
data to determine if the binary make-up of the block is identical. If the checksums on the source and target
machine are the same, the block is skipped. If the checksums on the source and target machine are not the
same, the block on the source is sent to the target. With this option, the entire file is not overwritten; only the
block that is received from the source is overwritten.
NOTE: The Mirror type setting also applies to the restoration connection.
Enable compression
This setting enables compression of data that is transmitted from the source to the target. Significant
improvements in bandwidth utilization have been seen in Wide Area Network (WAN) configurations, or in
any case where network bandwidth is a constraint.
Compression may be used in Local Area Network (LAN) configurations, though it may not provide any
significant network improvements.
You can specify compression for different source/target connections, but all connections to the same target will
have the same compression settings.
By default, compression is disabled. To enable it, select
Enable Compression , then set the level from minimum to
maximum compression.
Advanced settings
The Advanced tab includes advanced configuration options.