Re: [ILUG] Tape capacity question

From: Wesley Darlington (wesley at domain yelsew.com)
Date: Thu 30 Sep 1999 - 22:55:27 IST


Hi Folks,

On Thu, Sep 30, 1999 at 07:04:57PM +0100, Raymond Kelly wrote:
> My tape drive is is a not new DDS2 quad jukebox jobbie attached to an
> old DEC celebris server (p-100 era).
> The backups are done across nfs using tar (cfMp, no z cause it complains
> about compressing multi volume archives).

If you're just doing a `tar -cfMp remote:/dev/st0 /`, I'd be
inclined to ask it not to back up /proc. Create a file called
tar-excludes somewhere and use <something like>:

    tar -cMp --exclude=/root/tar-excludes --file=remote:/dev/st0 /

Said file might contain, among other things...

    /proc/*

> My question is bearing im mind that I'm using DDS3 tapes and the
> size/useage of the mounted partitions (df output below).
> Why the hell have I had to feed 5 tapes (so far)into the damn thing?

You're using DDS3 tapes in a DDS2 drive? *Raised eyebrow*
Never tried that...

> Just to give an idea of what won't fit on a tape, 2 redhat 6 iso images
> (sizes below) endend poking out either ends of one of these tapes

IIRC, DDS1 came in two varieties - 60m and 90m. The one could fit
about 1.2GB onto a tape and the other about 2GB. Uncompressed.

Could it be that your DDS2 drive is looking at the DDS3 tape,
wondering what the heck it is, deciding its a (lowest common
denominator) 60m DDS1 tape and writing 1.2GB to it?

> ideas about what I could do to reduce the amt of tape required would be
> helpful.

Get a DDS2 tape? Maybe even two, one for /crap?

Regards,
Wesley.



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