Re: port-alpha/48697: Sysinst compute illegal disk geometry and newfs is bound to fail.

[David Laight <david%l8s.co.uk@localhost>]

The following reply was made to PR port-alpha/48697; it has been noted by GNATS.

From: David Laight <david%l8s.co.uk@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: martin%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost, 
netbsd-bugs%netbsd.org@localhost,
        nullnilaki%gmail.com@localhost
Subject: Re: port-alpha/48697: Sysinst compute illegal disk geometry and newfs 
is bound to fail.
Date: Wed, 2 Apr 2014 22:22:20 +0100

 On Wed, Apr 02, 2014 at 08:25:01PM +0000, Michael L. Hitch wrote:
 >  
 >     Ah, it looks like maybe sysinst is computing the size of the disk by 
 >  multiplying the sectors/cylinder times cylinders - but the sectors/track 
 >  in the disk label is not correct.  The drive reports 727 sectors/track. 
 >  If sysinst had used the total sectors from the disklabel, it would have 
 >  been ok.  I would presume that Tru64 had set the sectors/track and 
 >  sectors/cylinder to those values.
 
 It is really best to believe the size that the driver gets from
 the disk itself - rather than that written to the disk.
 
 The 727 sectors/track value read from the label would then not matter.
 Indeed it might make the code know that the label is invalid.
 
 A cursory glance and the output from netbsd's disklabel seemed to
 show garbage values for the partitions - even though the checksum
 must have been correct.
 Maybe the structures don't quite match?
 
        David
 
 -- 
 David Laight: david%l8s.co.uk@localhost