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From: paulp@hpfcdc.HP.COM (Paul Perlmutter)
Newsgroups: comp.sys.hp
Subject: Re: Third-party SCSI disks under HP-UX
Message-ID: <5570571@hpfcdc.HP.COM>
Date: 7 Feb 91 13:44:31 GMT
References: <HARDY.91Feb5223940@golem.ps.uci.edu>
Organization: HP Fort Collins, Co.
Lines: 32


Making disktab entries is not all that difficult.  There are general
directions at the beginning of /etc/distab.  Read the header for that
file.  Also,  use /etc/diskinfo to find out the exact size of the
disk.

> and_40|andataco|maxtor8760:\
> 	:40 Mbytes swap:ns#27:nt#15:nc#1533:\
> 	:s0#621270:b0#8192:f0#1024:\
> 	:se#512:rm#3600:

Basically,  'ns' => number of sectors per track
	    'nt' => number of tracks per cylinder
	    'nc' => number of cylinders

	    s0 = ns*nt*nc

The drive should have information to help you fill in these numbers,
but it would not be unreasonable to simply make up your own  numbers
(at a small loss of performance).  The only strict rules are:

	numbers (in the disktab entry) are in terms of 1KByte
	s0 must be <= actual disk size (as reported by diskinfo)

Usually you can easily find out the number of surfaces (which helps
you determine the number of tracks) and the total number of 1K
cylinders.  If you cannot get the remaining information,  use
trial and error arithmatic.

Cheers,
Paul Perlmutter
paul@hppaul.fc.hp.com