BLOCK SIZE field (BLKSIZE subsystem parameter)
The BLKSIZE subsystem parameter determines the block size that is to be used for the archive log data set.
| Acceptable values: | 8192–28672 |
|---|---|
| Default: | 24576 |
| Update: | option 43 on panel DSNTIPB |
| DSNZPxxx: | DSN6ARVP BLKSIZE |
The block size must be compatible with the device type that you use for archive logs. The value is rounded up to the next multiple of 4096 bytes. You can also enter the value with a K; for example, 28K.
If the archive log is written to tape, use the largest possible block size to improve the speed of reading the archive logs. Use the table below as a guide.
| Archive log device | Block size |
|---|---|
| Tape | 28672 |
| 3390 geometry disk | 24576 |