HP Storage Mirroring V5 Software - Manual (Page 75)

HP StorageWorks Storage Mirroring Application Manager user’s guide 65
• 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.
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_<target server 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.
In order to change the replication set rules, first select the
Override Generated Rules checkbox. When this box is
selected, the File Shares control on the Connection tab will be disabled.