Use CSQ6LOGP to establish your logging options.
The default parameters for CSQ6LOGP, and whether you can alter each parameter using the SET LOG command, are shown in Table 9. If you need to change any of these values, refer to the detailed descriptions of the parameters.
Parameter | Description | Default value | SET command |
---|---|---|---|
DEALLCT | Length of time an archive tape unit remains unused before it is deallocated. | zero | X |
INBUFF | Size of input buffer storage for active and archive log data sets. | 60 KB | - |
MAXARCH | Maximum number of archive log volumes that can be recorded. | 500 | X |
MAXRTU | Maximum number of dedicated tape units allocated to read archive log tape volumes concurrently. | 2 | X |
OFFLOAD | Archiving on or off. | YES (ON) | - |
OUTBUFF | Size of output buffer storage for active and archive log data sets. | 4 000 KB | - |
TWOACTV | Single or dual active logging. | YES (dual) | - |
TWOARCH | Single or dual archive logging. | YES (dual) | - |
TWOBSDS | Single or dual BSDS. | YES (dual BSDS) | - |
WRTHRSH | Number of output buffers to be filled before they are written to the active log data sets. | 20 | X |
Specify one of the following:
Specifying 1440 or NOLIMIT means that the tape unit is never deallocated.
The default is zero.
When archive log data is being read from tape, it is recommended that you set this value high enough to allow WebSphere MQ to optimize tape handling for multiple read applications.
The default is 60 KB.
Suggested settings:
Test system | 28 KB |
Production system | 60 KB
Set this to the maximum for best log read performance. |
Use a decimal number in the range 10 through 1000.
The default is 500.
Suggested settings:
Test system | 500 (default) |
Production system | 1 000
Set this to the maximum so that the BSDS can record as many logs as possible. |
For information about the logs and BSDS, see the WebSphere MQ for z/OS Concepts and Planning Guide.
This parameter and the DEALLCT parameter allow WebSphere MQ to optimize archive log reading from tape devices.
Specify a value in the range 1 through 99.
The default is 2.
It is recommended that you set the value to be at least one less than the number of tape units available to WebSphere MQ. If you do otherwise, the off-load process could be delayed, which could affect the performance of your system. 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 off-load processing.
Specify either:
The default is YES.
The parameter must be in the range 40 through 4000. The value specified is rounded up to a multiple of 4.
The default is 4 000 KB.
Suggested settings:
Test system | 400 KB |
Production system | 4 000 KB
Set this value to the maximum to avoid running out of log output buffers. |
Specify either:
The default is YES.
For more information about the use of single and dual logging, refer to the WebSphere MQ for z/OS Concepts and Planning Guide.
Specify either:
The default is YES.
Suggested settings:
Test system | NO |
Production system | YES (default) |
For more information about the use of single and dual logging, refer to the WebSphere MQ for z/OS Concepts and Planning Guide.
Specify either:
The default is YES.
For more information about the use of single and dual logging, refer to the WebSphere MQ for z/OS Concepts and Planning Guide.
The larger the number of buffers, the less often the write takes place, and this improves the performance of WebSphere MQ. The buffers might be written before this number is reached if significant events, such as a commit point, occur.
Specify the number of buffers in the range 1 through 256.
The default is 20.
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