dummy.restore Definition/TCL

dummy.restore

Command dummy.restore Definition/TCL
Applicable release versions: AP, R83
Category TCL (746)
Description is a method of validating the restorability of a "save-type" (account-save, file-save, etc.) backup.

There are 3 methods to validate backup media:

1) The "t-chk" command, which looks for parity errors, but doesn't actually verify data.

2) Performing a "dummy restore" using the "sel-restore" with the "n" option without actually writing any items back to disk. This not only checks for parity errors, but also validates the "logical" format of the tape. If an unrestorable situation is encountered on the media, another backup can be made. See examples.

3) Using the "t-verify" command, which has the ability to not only do the same as steps 1 and 2, but also can compare each record from the media with its counterpart on disk to verify that they match. See "t-verify". This is the most reliable way to check tape integrity.

See the subject, "Tape Verify During Full Restore".
Syntax
Options
Example
:sel-restore md * (n
Restore from Full, incremental, transaction log (f/i/t):f
file#:99999

This will read every file in every account on the full save tape, looking for 
file number 99999 and in the process read the entire tape.
Purpose
Related tcl.file-save
tcl.t-chk
tcl.t-verify
tcl.t-att
tcl.set-floppy
tcl.set-half
tcl.set-sct
tcl.sel-restore
tcl.account-restore