On Wed, Jun 21, 2006 at 11:23:28AM -0400, up AT 3 DOT am wrote:
> On Wed, 21 Jun 2006, Jon LaBadie wrote:
>
> > On Wed, Jun 21, 2006 at 08:23:57AM -0400, Joshua Baker-LePain wrote:
> > > On Tue, 20 Jun 2006 at 10:59pm, up AT 3 DOT am wrote
> > >
> > > >Here's the complete report, now that it finally finished:
> > > >
> > > >su-2.05a$ amtapetype -f /dev/nrsa0
> > > >Writing 256 Mbyte compresseable data: 92 sec
> > > >Writing 256 Mbyte uncompresseable data: 90 sec
> > > >Estimated time to write 2 * 1024 Mbyte: 720 sec = 0 h 12 min
> > > >wrote 763218 32Kb blocks in 2334 files in 13153 seconds (short write)
> > > >wrote 757298 32Kb blocks in 4646 files in 20125 seconds (short write)
> > > >define tapetype unknown-tapetype {
> > > > comment "just produced by tapetype prog (hardware compression off)"
> > > > length 24034 mbytes
> > > > filemark 81 kbytes
> > > > speed 1530 kps
> > > >}
> > > >
> > > >Does this mean that this 35GB uncompressed tape is only yeilding 24GB?
> > >
> > > Yep, which means it's not an amanda issue. And I have no idea why it's
> > > doing that. Good luck with it. ;)
> > >
> >
> > 24GB, that is just about where it ran out during amdump too.
> >
> > I've no idea either; just a possible coincidence.
> >
> > In my tapechart DLT IV tape is shown as 1800 inches long
> > while DLT III tape is 1200 inches long.
> > That ratio , 1200/1800 is pretty close to the
> > 24GB (observed)/35GB (expected) ratio.
> >
> > Any chance these are just short tapes?
>
> If so, I've been defrauded...they are clearly stamped "FujiFilm DLT IV"
>
> > For all I know about DLT, the physical cartridge may have
> > changed between DLT III and DLT IV so my question is silly.
> >
> > I note your speed is pretty low compared to my chart listing,
> > 1.5 vs 5.0 MB/sec. Is DLT capacity affected by slow feed?
>
> Not sure...I noticed the speed as well. I had raised the conf parameter:
>
> From: netusage 1600 Kbps
> To: netusage 7200 Kbps
>
> I can't recall if that's bits or bytes (small b should be bits, right?).
> But I'll try raising it alot more, since all dumps are over 100mbit
> ethernet.
You are not running amtapetype across a network,
so the dump network usage parameter has no impact.
It is how fast your system can feed your tapedrive.
I'd look into your scsi system, check system logs for errors, try the
usual culprits, cables, terminators, ... Even with a mediocre scsi
card I can drive my lto-1 at about 90% of its rated speed. Even with
the ancient card I was first using I was getting nearly 7 MB/sec.
Something seems amiss with your setup.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
|
