Sorry, I assumed the original poster wanted, in his own words, to verify that the tape is actually good. IMHO, Reading the first few blocks for the tar header and perhaps a portion of the first file is not sufficient. If the purpose of writing the tape is to have the assurance of a restorable backup, the time spent performing a full read pass over the tape is a small price to pay for the peace of mind that actually knowing a backup is valid provides.
That being said, the quick and dirty kludge would be to use:
Code:
$ dd if=/dev/rmt0 bs=20b count=1 2>/dev/null | tar -tvf - 2>/dev/null | head -1
Howdy,
I'm trying to tar some directories to tape and then extract them from tape on another machine. I was hoping someone could help me with the syntax of the tar commands. Both machines are running Solaris 8.
Need to get all files and directories under the following:
... (6 Replies)
Hi,
The scenario is as follow:
Backup was done using:
tar cvf /dev/rmt/0mn file1.ext
tar cvf /dev/rmt/0mn file2.ext
tar cvf /dev/rmt/0mn file3.ext
tar cvf /dev/rmt/0mn file4.ext
tar cvf /dev/rmt/0mn file5.ext
When I do; tar tvf /dev/rmt/0m,
it only gives me the first file on the... (1 Reply)
I tried to buckup some oracle archive logs (from a solaris machine) to a remote tape (in a HP-UX machine).
I added the solaris machine name and user to .rhosts, and i tried to use this commande :
tar cvf HPhost:/dev/rmt/0mn /u01/*
The probleme that it gives:
HPhost:/dev/rmt/0mn : No such... (1 Reply)
Hi all!
I'm new in this forum. I need to ask a few question.
I would like to know if it is possible to use dump and tar command for backup in one tape.
If it is possible, how do I restore it back?
Fyi, I'm using the Digital Unix 4.0E OSF/1 box. (old box) :-)
Thank you. :) (0 Replies)
Hi,
I have tar: tape blocksize error when launching
# gunzip < TierDB.tar.gz |tar -xvf /data/ora/DREC
tar: tape blocksize error
Can you please help me ? It is urgent.
Many thanks. (1 Reply)
Hi Guy`s I`m a newbie to Unix and I`m starting to love it
I got stuck donig backups of tar files to tape
I use this to find all tar files
find . -name '*.tar.*' > output
in output there would be n of file eg. 6
the size output is 156 but tar files are:
9.3M Jul 18 09:48... (1 Reply)
Hello,
This might be a dumb question, but I havent been able to find the answer anywhere.
I currently have a backup script that uses 'tar' to backup some files to tape. I need to add a directory to the backup script, but I want to use 'vdump' to back it up to tape.
So my question is can I... (3 Replies)
Hi,
I am trying to determine if a tape is full because on 2 different tapes, im receiving 2 different kind of errors:
# uname
SunOS
# /bin/tar cvf /dev/rmt/0n /export/home
a /export/home/jerry/wlserver_10.0.tar.gz 28528 tape blocks
tar: write error: unexpected EOF
# mt -f /dev/rmt/0n... (5 Replies)
I've a tape contains a corrupt tar file. I'm using Unix SunOS 5.5.1. So when I run this command : dd if=/dev/rmt/0 of=/tmp/outputfile.tar
I get this error message :
warning /pci@1f, 0/pci@1/pci@1/sunw, isptwo@4/st@4,0 (sty): Error for command : read Error Level: Fatal Requested... (2 Replies)
Discussion started by: akaderb
2 Replies
LEARN ABOUT V7
tm
TM(4) Kernel Interfaces Manual TM(4)NAME
tm - TM-11/TU-10 magtape interface
DESCRIPTION
The files mt0, ..., mt7 refer to the DEC TU10/TM11 magtape. When closed it can be rewound or not, see below. If it was open for writing,
two end-of-files are written. If the tape is not to be rewound it is positioned with the head between the two tapemarks.
If the 0200 bit is on in the minor device number the tape is not rewound when closed.
A standard tape consists of a series of 512 byte records terminated by an end-of-file. To the extent possible, the system makes it possi-
ble, if inefficient, to treat the tape like any other file. Seeks have their usual meaning and it is possible to read or write a byte at a
time. Writing in very small units is inadvisable, however, because it tends to create monstrous record gaps.
The mt files discussed above are useful when it is desired to access the tape in a way compatible with ordinary files. When foreign tapes
are to be dealt with, and especially when long records are to be read or written, the `raw' interface is appropriate. The associated files
are named rmt0, ..., rmt7. Each read or write call reads or writes the next record on the tape. In the write case the record has the same
length as the buffer given. During a read, the record size is passed back as the number of bytes read, provided it is no greater than the
buffer size; if the record is long, an error is indicated. In raw tape I/O, the buffer must begin on a word boundary and the count must be
even. Seeks are ignored. A zero byte count is returned when a tape mark is read, but another read will fetch the first record of the new
tape file.
FILES
/dev/mt?, /dev/rmt?
SEE ALSO tp(1)BUGS
If any non-data error is encountered, it refuses to do anything more until closed. In raw I/O, there should be a way to perform forward
and backward record and file spacing and to write an EOF mark.
TM(4)