HP Storage Mirroring V4.5 Software - Manual (Page 82)

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Checksum— (Default) This option performs a checksum comparison calculation. 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.
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.
Replication set rules
A replication set defines what directories/files are to be protected by Storage Mirroring. By default,
Application Manager selects all of the necessary directories/files to protect the file server based on
your source server configuration. These include all non-administrative file shares. By default, the
Application Manager-generated replication set will be named
fileprint_
name>_
.
You should only modify the replication set rules if there are additional directories/files specific to your
configuration that must also be protected. Modifying the default configuration for replication set rules
may affect whether data can be successfully replicated. Do not modify the replication set unless you
are very familiar with Storage Mirroring.
NOTE: The Mirror type setting also applies to the restoration connection.