Depending on site requirements, the TSM server option values for the TSM server (dsmserv.opt) and the TSM Storage Agent (dsmsta.opt) might need adjustment. The following table describes these options.
| TSM Server Option | Description |
|---|---|
| COMMTIMEOUT | Specifies how long the server waits for an expected client message during an operation that causes a TSM database update. If a message does not arrive before the specified wait period, the server ends the session with the client. To prevent clients from timing out while backing up large files or during a heavy network load, increase the time-out value. |
| IDLETIMEOUT | Specifies the amount of time, in minutes, that a client session can be idle before the server cancels the session. To prevent clients from timing out due to a heavy network load in the environment, increase the time-out value. If the time-out value is increased, a large number of idle sessions could prevent other users from connecting to the server.
|
| RESOURCETIMEOUT | Specifies the maximum number of minutes that a storage agent waits for a resource on the server. The default value is 60 minutes. The minimum value is 1 minute. |
| TXNGROUPMAX | Indicates the maximum number of logical files (client files) that a client can send to the server in a single transaction. The server might create multiple aggregates for a single transaction, depending on the size of the transaction. |
The TXNGROUPMAX option controls the number of files allowed in a transaction. Set this option to 4080. Although the maximum value allowed is 65000, TSM limits the number of objects restored at the same time to 4080 objects.
Teradata Extension for Tivoli Storage Manager maps ARCMAIN backup files to a series of smaller storage objects or files segments with an object size of 2 GB. Therefore, the maximum size of a single backup cannot exceed 4080 * 2 GB, or approximately 8.1 TB.