READ TAPE UNITS field (MAXRTU subsystem parameter)
The MAXRTU subsystem parameter specifies the maximum number of dedicated tape units that can be allocated to concurrently read archive log tape volumes.
| Acceptable values: | 1–99 |
|---|---|
| Default: | 2 |
| Update: | option 43 on panel DSNTIPB |
| DSNZPxxx: | DSN6LOGP MAXRTU |
This installation option, along with the DEALLOC PERIOD field, allows Db2 to optimize archive log reading from tape devices.
In a data sharing environment, the archive tape is not available to other members of the group until the deallocation period expires. You might not want to use this option in a data sharing environment unless all recover jobs are submitted from the same member.
Recommendation: Set the READ TAPE UNITS value to be at least one less than the number of tape units available to Db2. If you do otherwise, the OFFLOAD process could be delayed, which would affect the performance of your Db2 subsystem. For maximum throughput during archive log processing, specify the largest value possible for this option, remembering that you need at least one tape unit for offload processing. You can override this value by using the SET ARCHIVE command.