Hi,
bpexpdate - changes the expiration date of the images in a tape. As per me if an image gets expired (or if -d 0 was selected in bpexpdate then all the images in that tape expires), that means data is still there and physically it is not deleted from the tape. Say if all the images are expired then when next backup will run for that pool the data in this tape will get overwritten. Am I right? And if not then what exactly expiration is doing with the data?
erase - If you do not need contents stored on tape, you can erase tapes. Erase will be enabled if the tape has no valid image and the tape is deassigned.
Short erase (fast) — use this option to speed up the erase process. The short erase operation does not physically erase data written on the tape. It simply loads the tape to the drive and wipes the tape header.
Quick erase writes an indicator at the beginning of the media and the contents of the media are made inaccessible. I did not get this.
Long erase (slow) – use this option to clear all data written to tape. The long erase operation loads the tape to the drive, rewinds the tape and physically erases all data written to the tape. I understood this.
Is formatting and erase same here? Or they are different?
Or can somebody explain the difference in leyman.
Thanks.