I have a few question on tape backup:
- every time i press the eject button, the drive does a rewind before
reject. Is this common? Is there a way to eject without rewind?
- related to the above question: if i cannot see how much tape has
been used, how can i judge whether the tape has enough room for my
next backup session? (i.e. whether this tape should be "recycled" by
starting from beginning.)
- In our current situation, each backup session fits in one single
tape. Is this common, or what happens if a tape backup session
requires multiple tapes?
- is there somewhere that explains the output of "mt status":
Mammoth EXB-8900 8mm Helical Scan tape drive:
sense key(0x0)= No Additional Sense residual= 0 retries= 0
file no= 3 block no= 0
- if i do "mt fsf n" where n is large, i get
/dev/rmt/0n fsf 1 failed: I/O error
is this normal?
- what is the difference between fsf and fsr? (i.e. EOF vs records)
- i believe i have searched deep and wide on tape backup manuals and
docs. Including Sun's 2 or 3 volume Solaris Sys Admin, also parts of
the book _Unix Backup & Recovery_ W. Curtis Preston. There seems to
have very little info on how backup is done manually through tar, and
virtually no info on "mt" command. (expect the man page, which expect
one to have implemented unix) Is there a resource, a simple
introduction, a compprehensive manual, that covers the unix manual
backup process using tar and a tape drive?
- why unix so sux arses to the hilt?
We have a solaris Enterprise 220 server.
I do weekly backup manually, from a directory that contains all files
needed to backup, to a single tape, by this command, e.g.:
tar cf /dev/rmt/0n /backup_source_directory
The external tape drive is a model with part number: 599-2081-01, made
The tape drive has no markings to indicate model etc. I think it is
Sun Storedge Unipack.
(Sun products are so confusing. I can't even find a exact page online
for my drive's model, spec or manual)
The tape used is EXATAPE, Exabyte 170m AME Mammoth, 8mm data catridge.