HP Storage Mirroring V5.1 Software - Manual (Page 91)

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Session Interval—This option begins transmitting Storage Mirroring data at specified
intervals of time. This option is used in conjunction with Transmission session start. For
example, if the Session Interval is set to repeat transmission every 30 minutes and the
Transmission session start is set to begin transmitting at 10 p.m., if the queue is emptied
at 10:20 the transmission will stop. The start criteria is again met at 10:30 and Storage
Mirroring will begin transmitting any new data in the queue. Specify an interval for additional
transmissions by indicating a length of time and choosing minutes, hours, or days.
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Queue Threshold (percentage) and Queue threshold (bytes)—If the allocated amount
of queue disk space is in use, Storage Mirroring cannot continue to queue data causing an
auto-disconnect and the potential for loss of data. To avoid using the entire queue, you can
configure Storage Mirroring to begin transmitting data to the target when the queue reaches
a certain point. This point can be defined as a percentage of the disk queue that must be in
use or the number of bytes in the disk queue. For example, if you specify 40%, when 40% of
the queue is in use, Storage Mirroring initiates the transmission process and sends the data
in the queue to the target machine. The transmission stops when the queue is empty or a
Storage Mirroring stop transmission criteria is met. Or you might set a queue threshold of 500
MB. Storage Mirroring will wait until there is 500 MB of data in the queue and then begin
transmitting the data. Like other start criteria, Storage Mirroring continues transmitting until
the queue is empty or a Storage Mirroring stop criteria is met. Specify a percentage of the disk
queue and system memory that must be in use to initiate the transmission process, and/or
specify the number of bytes that must be in the source queue and system memory to initiate
the transmission process.
4. Schedule any desired stop criteria to stop transmission after a transmission start criteria has
initiated the transmission. If you do not establish a stop criteria, transmission will end when the
queue is empty. Select the Stop option in the Limit Type box.
Define the stop options to stop Storage Mirroring transmissions by using either or both of the
following options.
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Time Limit—The time limit specifies the maximum length of time for each transmission
period. Any data that is not sent during the specified time limit remains on the source queue.
When used in conjunction with the session interval start option, you can explicitly define how
often data is transmitted and how long each transmission lasts. Specify the maximum length
of time that Storage Mirroring can continue transmitting by indicating a length of time and
choosing minutes, hours, or days.
NOTE: A Transmission Session Start setting will override any other start criteria. For
example, if you set the Transmission Session Start and the Queue
Threshold, transmission will not start until you reach the indicated start time.