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 - Dare to fix things before they break . . . - 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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