Also sprach Gene Heskett (Thu 03 Jul 02003 at 02:51:39PM -0400):
> On Thursday 03 July 2003 11:42, Michael D. Schleif wrote:
> >Yes, I am learning -- at the expense of many questions ;>
> >
> >First, a brief overview:
> >
> >I have five (5) Linux servers, totaling ~50 Gb used diskspace,
> > divided roughly even across all five.
> >
> >I have several DAT tape drives, the largest of which is an HP DDS-3.
> > I have twelve (12) DDS-3 tapes, and twenty (20) DDS-2 tapes, as
> > well as several cleaning tapes.
> >
> >So far, I have configured:
> >
> > dumpcycle 7
> > runspercycle 7
> > runtapes 1
> >
> You left out tapecycle, which is the number of tapes in the rotation
> pool, in this case it should be not less than 15.
Wouldn't that be eight (8)?
runspercycle * runtapes + 1
<snip />
> One thing to be aware of is that a tape, once written in the
> compressed mode, remembers that, and will overwrite your choices
> unless you go to a rather detailed method of removing the compressed
> flags.
How do I do this?
These tape drives have all used compression, and many of these tapes
have been used once or twice. So, it looks like I will *not* use
hardware compression, and I want to reap all of the benefits of that
strategy.
Also, what is the best way to turn off compression?
# sudo mt-gnu -f /dev/nst0 datcompression
Compression on.
Compression capable.
Decompression capable.
# sudo mt-gnu -f /dev/nst0 datcompression 0
Compression off.
Compression capable.
Decompression capable.
# sudo mt-gnu -f /dev/nst0 datcompression
Compression off.
Compression capable.
Decompression capable.
Will this persist across power cycles? Will previously hardware
compressed tapes turn hardware compression back on?
What do you think?
--
Best Regards,
mds
mds resource
877.596.8237
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Dare to fix things before they break . . .
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Our capacity for understanding is inversely proportional to how much
we think we know. The more I know, the more I know I don't know . . .
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