>  From what I read in the stinit man page, the default is to use the 
> device-specific addresses.
> So, if we set this to 1, then we will be using Logical block addresses 
> instead. If we change
> this, should we still be able to recover data that was written to tape 
> when the value was
> previously remarked out (i.e.  set to use device-specific addresses.)?

I think you'd have to try it to be certain.  There may be no difference.

Networker does quite a bit of sanity checking on recovers.  It has to
find confirmation that it's at the right point in the tape.  It'll even
fall back to reading an entire tape file rather than seeking within it
if the seeks appear to put it at the wrong position.

> It's odd, though, because the current documentation that Quantum has, 
> and what
> you use for your HPs, and one other source I found all indicate that 
> LTO3, 2 and 1 should use
> 0x44, 0x42 and 0x40 for the density codes respectively. However, the 
> older documentation
> that Legato has that someone else posted earlier 
> (ftp://ftp.legato.com/pub/HW_Support/compatguide/stinit.def)
> indicates density=0x00 for both LTO-1 and LTO-2 for IBM and HP. This 
> seems like an odd discrepancy, doesn't it? The link
> you mentioned ( 
> http://www.nclug.org/pipermail/nclug/2002-August/004162.html)
> doesn't include definitions for LTO. The document does list another 
> link, but
> that link comes up empty but looked to be dlt only.

I've seen a number of devices that default to density=0x00.  I believe
that such a density is interpreted as the "device default".  So 0x00
would give you the highest density/compression on the drive in most
cases.

> Maybe this was never correct to begin with, but this has worked fine for 
> us. Now, I'm
> wondering, though, what will happen when I try to read those tapes on 
> the new LTO-3 drives with the following
> modes???:

density/compression modes are always ignored when reading.  They have no
effect.  

Density only matters for writes at the beginning of tape.  Compression
only matters for writes.

-- 
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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