pichi wrote:
> I did not modify anything and recovered the file with no problems. But my
> question is why was I able to recover the file without the use of the
> bootstrap file? I guess I am having conceptual problems because I though I
> needed both the .bsr and the .sql file to rebuild or am I missing
> something??
A bsr file is a set of directions on restoring something. They are typically
built up in one of two ways: either by the restore command, based on
extracting data from the catalog, or as part of a backup, based on the
director making notes of what's going into the catalog.
Typically, you will only ever need the former. The second one comes into play
in recovering the catalog. Assume that for whatever reason, you no longer
have a viable copy of the catalog anywhere on disk. You do have a backup of
the catalog, which was backed up as it's own separate backup job, but it's
100M hidden somewhere on a 400G tape. If you still have the bsr file that was
created as part of backing up the catalog, however, you can use that to
efficiently extract the last catalog backup from tape without having to search
the entire tape.
Worst case, if you don't have the sql file, you can rebuild the contents from
the volume data using the bscan program. It'll take some time, but it gets
the job done.
So to summarize:
- if you have the sql file, you don't need the bsr
- if you have the sql file, but it's buried somewhere in your backup volumes,
the bsr is the best way to get at it quickly
- if you don't have the sql file, you can fake it with bscan
--
Frank Sweetser fs at wpi.edu | For every problem, there is a solution that
WPI Senior Network Engineer | is simple, elegant, and wrong. - HL Mencken
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