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Determining Whether the Data Movement was LAN-free
Use the following guidelines to help determine whether the data is moving on the
LAN-free path:
v Monitor the QUERY SESSION output against the node that is running the
LAN-free backup. Review the bytes sent and bytes received. You can perform
this action by using a Tivoli Storage Manager administrative command-line
client to login to the Tivoli Storage Manager server and storage agent to verify
that the proper sessions have been established. When LAN-free data movement
is occurring, a QUERY SESSION on the storage agent should show bytes
received (displayed as bytes recvd) for the node increasing to the total amount
of data being backed up. The QUERY SESSION on the Tivoli Storage Manager
server should show a very small number of bytes of metadata received for the
same node. If the node’s session exhibits this behavior, the data movement is
LAN-free.
Note: During a failover where the storage agent is sending data directly to the
server by proxy because it cannot store the data directly, the QUERY
SESSION statistics on the server will show a much higher byte count.
v Issue either of the following QUERY ACTLOG commands on the server to
which the client is connected:
query actlog search=storage_agent_name msgno=8337
query actlog search=storage_agent_name
If the query finds entries in the activity log that relate to the storage agent, the
client is using LAN-free data transfer.
Chapter 4. Installing and Configuring External Library Environments 41