Re: DUMP: Premature end of tape detected Sony 20/40GB LVD DDS4 150m


Bruce Burden wrote:
> whereis@xxxxxxxxxxxx wrote:
> :
> : After about 17GB worth of a backup using dump, I'm hitting the
> : end-of-tape marker. Even without compression enabled, I should be
> : able to fit 17GB on this tape; with compression enabled, there should
> : be MORE than ample room. The dump command is
> :
> : /sbin/dump -0auf /dev/nst0 /path
> :
> Just a couple of ideas:
>
> 1) What is a "st" device? Did you mean "sa"?

yes I did. The device is /dev/nsa0

>
> 2) How much compressed data are you backing up? It is my
> understanding that the 2x compression factor is a bit
> of marketing by comapines. Furthur, attempting to compress
> already comprssed data can result in taking up more space
> than not attempting furthur compression of the data.

Most of this data is not already compressed. Just a bunch of
text files. I manually created one file that is large enough to bring
the total to around 17GB. I'm reading these values from the
output of du and dh.

> 3) Perhaps the "missing" 3GB is being used in overhead? I
> am leary about that, but if you have enough directories/
> files/etc, I suppose it could happen.

Overhead? Not sure what that means. I've never had so many
files that they would cause a backup issue like this (??) :)

>
> 4) HOW THE HELL DO YOU RESTORE MULTIPLE TAPES? Gaa!!!!! I
> can't figure that one out. I made a multi-tape dump, but
> restore -i just gives me nada when I attempt to restore...
>
> Bruce

I don't normally use multiple volumes for backups so I many not
be much help here but according to the man page, restore is
supposed to automatically notify you when the next volume is
required.

> --
> ------------------------------------------------------------------------
> "I like bad!" Bruce Burden Austin, TX.
> - Thuganlitha
> The Power and the Prophet
> Robert Don Hughes

.

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