Hp Storage Mirroring Software User Manual download pdf (Page 66)

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! Start Replication on Connection—Replication can be initiated immediately when the connection is established. If

replication is not configured to start automatically, you must start it manually after the connection is established or set a

schedule to start it later.

Throughput Diagnostic Utility

Built into Storage Mirroring is a null, or non-existent, target that allows you to imitate a normal connection without passing

any data across the network. The purpose of this connection is to generate statistics that can be used in approximating the

time and amount of bandwidth that this connection will use when actively established. The name of the target is TDU or

Throughput Diagnostics Utility. The statistics are logged to a file. By default, the file is called

statistic.sts.For more

information on the statistics logging file, see DTStat on page 13-26.

Connection IDs

A unique connection ID is associated with each Storage Mirroring connection. The connection ID provides a reference point

for each connection and is used as an option in many of the DTCL commands.

Each connection is assigned an ID which is a sequential number starting at one. Each time a connection is established, the ID

counter is incremented. It is reset back to one each time the Storage Mirroring service is restarted. For example, if the Storage

Mirroring service was started and the same replication set was connected to five target machines, each connection would have

a unique connection ID from 1 to 5.

The connection IDs are displayed in the Management Console and the Text Client, but are not displayed in the Command

Line Client. If you are using the Command Line Client, you will need to keep track of the connection ID manually or establish

a variable so that the connection ID can be used with the DTCL commands. For detailed steps on creating variables, see

Variables on page A-38.

Connection Resources

If you are using Storage Mirroring on a Microsoft Cluster Server, Storage Mirroring has installed a resource to allow you to

use a node as a Storage Mirroring source or target. The resource is called the Double-Take Source Connection.

NOTE: If you disable Start Replication on Connection, you will need to perform a mirror prior to beginning

replication to guarantee data integrity.

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Hp Storage Mirroring Software User Manual Page 66