Network latency can be high in the following scenarios, and you can consider using
the chunk size to see if anything improves.
■ Data transmitted over a long distance and an IP network that is used for the
transmission along with FC.
■ Data transmitted over a long distance through an FC-only connection.
Note: If you observe a big downgrade on backup performance over a
short-distance FC-only connection, try adjusting the chunk size and see if there
is any improvement.
The default value for chunk size is "0", which means the chunk size is not set or
used. If you set the chunk size to a value equal or greater than "1", you specify the
size of each data chunk that is sent to the FC network. To enable and manage the
chunk size setting, use the Main > Support > FibreTransport > ChunkSize
command from the NetBackup Appliance Shell Menu. The available chunk size
range is 1-2048 KB. The recommended values are 128 KB, 256 KB, 512 KB, 1024
KB, or 2048 KB. You may also need to test with other values to determine a proper
value for your environment.
The chunk size may not work for the following reasons:
■ A limited bandwidth
■ Network congestion
■ Not using a dedicated data network
Configuring Fibre Transport on a target appliance
for optimized duplication and replication
The Fibre Transport Deduplication feature enables you to use a NetBackup 52xx
or 53xx appliance as a target host for optimized duplication and Auto Image
Replication over Fibre Channel (FC).
If you have configured one or more target ports for Fibre Transport Deduplication,
and you do one of the following, you cause the physical state of one or more ports
to change:
■ Enabling the Fibre Transport Deduplication feature
■ Disabling the Fibre Transport Deduplication feature
■ Changing the port mode configuration when the feature is enabled
71Configuring Fibre Transport on the appliance
Configuring Fibre Transport on a target appliance for optimized duplication and replication
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