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From: mod@masscomp.ccur.com (2915)
Newsgroups: comp.sys.concurrent
Subject: Re: Help with disk partition problem?
Message-ID: <3420@gazette.bcm.tmc.edu>
Date: 2 Jan 91 04:03:09 GMT
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In article <3367@gazette.bcm.tmc.edu> steve@eros.ame.arizona.edu (Steve Cannon) writes:
>I have a Masscomp 5520 running RTU 4.1A with a Fujitsu Eagle disk
>that has 2 partitions - da0 and da0b. Occasionally when df is
>executed it comes back with a message something like "... unable
>to access da0" and the regular info for da0b. The only way I've
>found to clear up this problem is to reboot the system. Two 
>questions:
>
>   1. Any ideas as to why I am getting this message?
>
>   2. Is there another way to correct this problem (short of
>      rebooting the system)?

Hello,

I use a 5520 as my daily development machine and haven't seen this
problem, so I can only speculate...  df wants to be able to read
/etc/mtab, /etc/fstab and whatever /dev entries are appropriate.
Therefore, if permissions are wrong or one of these files is
missing df will probably not do anything very useful.  /etc/mtab
is rebuilt as the system starts up, so your report that rebooting
fixes the problem might indicate something in that direction.

If ALL further attempts to access /dev/da0 are unsuccessful then
I'd say you have uncovered some problem much bigger than a simple
bug in df - is this the case, or is df the only program that
chokes?  Come to think of it, I have seen some folks have troubles
related to the fact that /dev/da0 is supposed to be a synonym for
/dev/da0a (ie. they SHOULD have the same minor device numbers -
               preferably linked to the same inode)

Well, that's all I can think of after reading your posting.  I hope
I suggested at least SOMETHING you haven't already thought of...   ;->

Regards,
 ----------------------------------------------------------------------------
  Michael O'Donnell    (508)392-2915    home(508)251-7576    fax(508)392-2492
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  DISCLAIMER: My opinions only coincidentally resemble those of my employer.
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