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- Xref: sparky comp.unix.aix:12541 comp.unix.questions:14670
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- From: op@holmes.acc.Virginia.EDU (Olaf Pors)
- Newsgroups: comp.unix.aix,comp.unix.questions
- Subject: Re: Parameters (density, length, etc.) needed for rdump
- Keywords: density size length backup dump AIX 8mm Exabyte
- Message-ID: <1992Dec14.135502.28081@murdoch.acc.Virginia.EDU>
- Date: 14 Dec 92 13:55:02 GMT
- References: <1992Dec7.195704.6742@athena.mit.edu>
- Sender: usenet@murdoch.acc.Virginia.EDU
- Organization: University of Virginia
- Lines: 40
-
- In article <1992Dec7.195704.6742@athena.mit.edu> herrera@athena.mit.edu (Ramon F Herrera) writes:
- >I have been backing up using the Exabyte 8 mm. drive
- >that comes with my RS/6000, but I don't think I
- >am getting the whole capacity. Although my tapes are
- >the longest ones (112 meters) available, it seems
- >that I cannot store more that about 1 gigabyte.
- >
- >I understand that those tapes can hold a little
- >over 2 gigabytes.
- >
- >The question is: what numbers should I use for the
- >density and other parameters, in order to take full
- >advantage of a tape?
-
- Here's what we use to get the full capacity:
-
- /etc/rdump -0 -u -s 100000 -b20 -f host:/dev/rmt0.1 /usr
-
- We also use 10k blocks:
-
- chdev -l rmt0 -a block_size=10240
-
- >Bonus question: isn't AIX (3.2) supposed to ask me to
- >insert a new tape when it gets to the end? Right now
- >it is not asking anything, just gives these messages
- >(yes, I have tried different tapes & they are brand new):
- >
- >rdump: Tape write error 996 feet into tape 1 (sometimes it's 995 feet)
- >rdump: TAPE ERROR!
- >rdump: fopen on /dev/tty fails
- >rdump: Child 18205 returns LOB status 206
-
- This is guaranteed to happen if you use rsh to start up the
- rdump since rsh does not provide a /dev/tty. rdump is trying
- to tell you about end of tape, but can't since it can't
- open /dev/tty. Use telnet or rlogin instead.
-
- Olaf Pors
- Academic Computing Center/ITC
- University of Virginia
-