I used to do more, but recently (on my v5.1 NetBackup setup) I've
- look at /usr/openv/netbackup/db/media/errors once or twice a week,
generally Monday and Friday when I tried to review that each client was
having successful backups.
- From the errors file, I'd look to see if there were "too many" errors
or if there was a pattern of errors such as on one tape drive. Clean that
tape drive (cleaning may not be an appropriate action for your drive)
- For each tape that had an error, freeze it:
- /usr/openv/netbackup/bin/admincmd/bpmedia -freeze -m <tapeid> -h
<serverid>
- Note that if no data was written, the tape is free and can't be
frozen. For this case, change the tape to a different pool, my Baudelaire
pool (for tapes that have had a hard time).
- Run the "Media Summary" job in verbose mode. For each tape listed as
frozen and expired:
- expire it with "sudo bpexpdate -d 0 -force -m <tapeid>
- change it to my Baudelaire pool
- Now and again, whenever I was short of tapes or had the time or
inclination, and a free tape drive, do a quick erase on the tapes in the
Baudelaire pool and return the successful erased-tapes to Scratch.
- Now and again, run the errors file through a stats program to find the
number of errors for each tape. Discard or return to vendor tapes with "too
many" errors. Alternatively, I'd sometimes suspect a tape of being "bad"
and would run "cat /usr/openv/netbackup/db/media/errors|grep <tapeid>" to
see the count, with the advantage of seeing the dates of each error.
I've never seen a tape automatically go out of freeze state, but I've frozen
many more tapes than NetBackup does with its "x errors in y hours" rule.
Also, most of my "real" errors on my LTO-I tapes were write errors; almost
all read errors could be accounted for by the tape recently having a write
error.
Nicely, I won't be doing any of this soon, as I'm well into switching to a
6.5 system writing to a Quantum 6550 which has a remote 6550 partner. I'm a
big fan of writing to disk and using OST and a Storage Lifecycle Policy
instead of tapes and "NetBackup Vault" to make copies of tapes. Very slick.
Cheers, Wayne
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