Tape Rewinding

2007-12-25 11:31:00

Summary:

Thanks to the following sun-managers (I hope I didn't omit anyone):

Sean Ward

Dwight Petersen

Special thanks to Derek Terveer, who gave me a good "mt" command to work with:

"I believe that the dump command always states that it is rewinding, but

if you do a "mt -f /dev/rmt/1n status" on tst2-a after the dump, it may

actually be where you expect it..."

So, it seems to be almost unanimous, the tape isn't rewinding. It just

says it is. What an interesting feature. Here are a few of the responses.

~How do you know that "in fact the tape DOES rewind"

~The dump message says that it rewinds, but in *fact*

~it does not. I am on solaris.

~How do you know? Because dump tells you so in its output? Don't believe

~a word, it ALWAYS claims to rewind the tape (and I did the multi-FS-tape

~restores to prove different ;-).

~Are you sure that it's really rewinding? Dump always says that it is

~rewinding the tape at the end of a run, but that is a lie. It just closes

~the device, knowing that it will rewind if you don't use the non-rewind

~device.

Thanks again for the excellent help.

Martin Meadows

Here's the original question/post:

> Sun Wizards,

> Recently I've been working on a SunOs 4.1.3_u1 vA system. I'm trying

> to use the following command to dump its / filesystem to an 8mm tape

> on a remote machine (that's running Solaris 2.5):

> dump 0uf tst2-a:/dev/rmt/1n /

> I expect the tape NOT to rewind after the dump completes but in

> fact the tape DOES rewind. Am I doing something wrong?

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