For me, I'm just tarring up hosts to tape. When the tape develops an
error, and I use software compression (i.e. -zvvcf /dev/nst0), then I'll
lose the whole session. If I let the tape drive compress, it won't
compress as good (like you said), but at least I only lose a file or two.
-kf
On Thu, 21 Oct 1999, Stephen Waters wrote:
> i've found that software compression (with our cheesy seagate backup
> exec s/w anyway..) compresses better than hardware because it is able to
> reorganize the data in a more compressible manner rather than the drive
> just compressing whatever hits the buffer.
> we average just under 18GB per tape w/ full compression, although i have
> seen instances where it would hit 20GB. it's extremely data dependant i
> would expect.
>
> then again, i could just be talking out of my ass again... :)
>
> -s
>
> Thomas Seidel wrote:
> >
> > I'm sorry this is a bit off-topic, but large raid sets need big backups ;-)
> > My HP SureStore DAT24 stops after writing 12 GB of data to a DDS-3 tape. I
> > suspect there must be something wrong with the compression. To verify this I
> > need some additional information:
> >
> > - What are the right dip switch settings of the DAT24?
> > - Did 'mt datcomression 2' really switch the compression on??
> > - What is the best block size for the dump command???
> > - Any other topics I have to look for????
> >
> > Oh, the box: kernel 2.2.9 & Adaptec AHA-2940 at 10 MB/s narrow sync, Dual
> > Processor Board with two PII/400
> >
> > Thanx
> > Thomas
>
