In a VSE environment, only the online mode of operation is available.
Table 1 shows the ICKDSF commands you can use to secure your data sets and prevent data loss on DASD volumes.
Because the ANALYZE and MAPALT commands do not write on any user tracks and do not transmit any user data from the device, they require no security measures.
| If you specify the | It ensures… |
|---|---|
| VERIFY parameter of the INIT, INSPECT, REFORMAT, and TRKFMT commands | The volume serial number and owner identification supplied in the command match those found on the volume. If they match, the command continues to run. If they do not match, the command ends. |
| NOPURGE parameter of the INIT command | If unexpired files, data-secured files, or VSAM files are on the volume, INIT ends. |
| PURGE parameter of INIT or NOPRESERVE parameter of INSPECT, or TRKFMT command | If unexpired files, data-secured files, or VSAM files are on the volume, data loss is prevented. |
PURGE or NOPRESERVE parameters prevent data loss as follows:
Unexpired files: Message ICK001D requests permission to purge the volume contents. Only one request is made, regardless of the number of unexpired files on the volume. ICKDSF does not provide a list of the unexpired files.
Data-secured files: Message ICK017D prompts you with the name of the secured file. Message ICK018D requests permission to purge the file. This sequence is repeated for each data-secured file on the volume.
VSAM files: If a single VSAM file is found on the volume, message ICK019D requests permission to purge all the VSAM files on the volume.
For more information on these messages, see Device Support Facilities messages (ICK).