Run the DSPTAP *LABELS command to *PRINT. To determine how much save/restore data is on a cartridge, add all the file lengths and multiple by (block length less 4096). This gives you how many bytes are written to the tape.
Example:
| Data File Label | File Sequence |
Block Format |
Recg Tech |
Record Length |
Block Length |
|---|---|---|---|---|---|
| SAV20200302 | 0000000001 | *U | P | 00000 | 262144 |
| File Length |
Mvol Ind |
Mvol Sequence |
Date Created | Expiration Date |
|---|---|---|---|---|
| 000232033 | CONT | 0000000001 | 03/02/20 | *PERM |
232033 x (262144 – 4096) = 59,875,651,584 B
Data compression, if used, affects this figure; however, there is no way to calculate the effects.
In addition, if using a tape drive that is capable of optimum blocking and Use Optimum Block *YES is specified, there is no way to calculate how much more data can be written to the tape cartridge. Note: There is a minimum 20 percent margin of error when using this calculation. If the tape has sequences with different block lengths on it, you should group the different entries together. Do the calculations for each group/label, and add them all together (*) to get the total amount of data on the cartridge. 262144 0000232033
*Please note that you have to tally them up for each label.
