-R add checks into the process to ensure there was already a valid
networker label on the tape before writing a new one... If you don't use
-R and there's been a problem with mis-ordered drives then -R will save
you from accidental destruction of data. It only carries the history
data over from the old label when the old one was still in the media
database.
-B is a silimar flag - it checks there is not a networker label on the
tape before labelling it - this also helps prevent accidental
destruction of data when jukebox inventories are wrong.
-Y skips asking you the question.
I always use -R or -B in scripts that relabel/label tapes so if
anyhting is wrong the operation fails in a safe way that you can recover
from.
There's the odd case where you do need to do relabelling without the -R
flag, and there are also cases when you have to delete a volume first
with nsrmm - but only if you take care to make sure nothing is wrong
with the system first.. I see no need for anyone to be using tar or dd,
it's a waste of time and risky.
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of George Sinclair
Sent: Saturday, 27 September 2008 6:22 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Relabeling a tape versus recycling - I'm confused?
If you re-label a tape (not using the same volume name), what's the
difference between doing it this way:
nsrjb -s server -L -b pool_name -S slot
and the answering 'yes' when it asks if you want to overwrite, versus
running this instead???:
nsrjb -s server -L -b pool_name -R -S slot
I've always used the first method, although if it has an associated bar
code, and I don't plan to reuse the bar code label, then I always remove
it from the media database first to avoid associating the previous bar
code with the new volume. Also, I remove it first if I'm re-labeling it
with the same volume name.
According to the man page for nsrjb and nsrmm, the '-R' option re-writes
the label. Wouldn't this happen anyway? If you don't specify the '-R'
option then what happens? Clearly, NW has to have some way to store the
new volume name on the volume, right? Why would it not re-write the
label?
I'd read somewhere that when re-labeling a tape that you should first
remove it from the database (nsrmm -d) and then tar some data to it and
then label it? Is this the same as using '-R'.
Can someone please straighten me out on this issue.
Thanks.
George
--
George Sinclair
NOAA/NESDIS/National Oceanographic Data Center
SSMC3 E/OC3 Room 4145 | Voice: (301) 713-3284 x210
1315 East West Highway | Fax: (301) 713-3301
Silver Spring, MD 20910-3282 | Web Site: http://www.nodc.noaa.gov/
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