HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96317, June 2009)

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Scheduling transmission criteria and bandwidth
limiting
Using the Connection Manager Transmit tab, you can set start and stop criteria along with a schedule
window.
1. Right-click the connection on the right pane of the Management Console and select Connection
Manager.
2. Select the Transmit tab. The Transmit tab contains four limit types: Bandwidth, Start, Stop,
and Window. The transmission options for each limit type are displayed by highlighting a
selection in the Limit Type box.
At the top of the Transmit tab dialog box, the Enable Transmission Limiting check box
allows you to turn the transmission options on or off. You can enable the transmission options
by marking the Enable Transmission Limiting check box when you want the options to be
applied, but you can disable the transmission options, without losing the settings, by clearing
that check box.
Also at the top of the Transmit tab dialog box, the Clear All button, when selected, will remove
all transmission limitations that have been set under any of the limit types. The Clear button will
clear the settings only for the Limit Type selected.
3. Select the Bandwidth option in the Limit Type box. Mark the Limit Bandwidth check box to
enable the bandwidth limiting features. Define the bandwidth available for Storage Mirroring
transmission by using either of the following options.
 Percentage—Specify the percentage of bandwidth to be used for Storage Mirroring
transmissions and the total bandwidth capacity that is available.
 Transfer Rate (bytes/second)—Specify the number of bytes to send every second.
NOTE: Storage Mirroring checks the schedule once every second, and if a user-defined criteria
is met, transmission will start or stop, depending on the option specified.
Any replication sets from a source connected to the same IP address on a target will share
the same scheduled transmission configuration.
NOTE: The only value that is persistently stored is the number of bytes per second. When
the page is refreshed, the percentage and available bandwidth may not be the
same value that you entered. Storage Mirroring changes these values to the
maximum values for the smallest possible link. For example, if you enter 10% of
T1, this is equivalent to 19300 bytes/second. If you select another transmit option
or another tab of the Connection Manager and then return to the bandwidth
option, Storage Mirroring will change the value to 60% of 256 Kbps which is also
equivalent to 19300 bytes/second.