HP StorageWorks Storage Mirroring user's guide (T2558-96073, February 2008)

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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.
 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.
 Byte Limit—The byte limit specifies the maximum number of bytes that can be sent before ending the transmission
session. When the byte limit is met, Storage Mirroring will automatically stop transmitting data to the target. Any
data that still remains waits in the source queue until the transmission is restarted. When used in conjunction with
a session start option, you can explicitly define how much data is being sent at a given time. Specify the maximum
number of bytes that can be sent before ending the Storage Mirroring transmission.
5. Schedule a transmission window to establish a period of availability for all Storage Mirroring transmissions. You can
specify a begin and end time for all Storage Mirroring transmissions. When a transmission window is in effect, all other
start and stop criteria are bound by this window. This means that Storage Mirroring will never transmit data outside of
an established window, regardless of other transmission settings. For example, if you set a window of availability from 9
p.m. to 4 a.m. and a start option to initiate transmission at 5 a.m., the window option will override the start option and
no data will be sent at 5 a.m. Select the
Window option in the Limit Type box.
NOTE: The transmission start and stop criteria should be used in conjunction with each other. For example,
if you set the Queue Threshold equal to 10 MB and the Byte Limit equal to 10 MB, a network
connection will be established when there is 10 MB of data in the queue. The data will be transmitted
and when the 10 MB Byte Limit is reached, the network connection closes. This is useful in
configurations where metered charges are based on connection time.
NOTE: Setting a transmission window by itself is not sufficient to start a transmission. You still need to set a start
criteria within the window.