SUMMARY: Filesystem Compatibility

From: Sam Sampath (
Date: Tue Mar 03 1992 - 08:06:45 CST

My original post:

>We have a SUN 4/280 running SUNOS 4.0.3 (for some
>historic reason). One of its disks with / and /usr went bad,
>so I had to replace it and reinstall / and /usr on it.
>I couldn't find SUNOS 4.0.3 install tapes, so I used
>SUNOS 4.1 tapes to load miniroot and restored / and /usr.
>I ran installboot and everything looked fine.

>When I tried to reboot, it always ended up in single
>user mode and the system panics whenever it tries to
>get into multi user mode. Is there a filesystem
>compatibility problem? Any workarounds will be sincerely

The filesystem format was changed from 4.0 to 4.1. A lot of people
suggested that fsck -c might work. If that doesn't fix it, Dieter
Muller <> suggested that I should try restoring
newfs/mkfs from 4.0 backup and run fsck again. In the mean time, I found
4.0.3 tapes from someone here and things were back to normal. Time
constraints forced me not to try your suggestions. Thanks for your
valuable suggestions. The following people responded to my

 Dieter Muller <> (Hans-J. Nagel) (Russ Poffenberger)
 chchua@csam.MY (CH Chua {CSA Malaysia}) (Mark Plotnick)
 Barry Margolin <barmar@Think.COM>
 Bill Rea <> (Benny Yih)
 Chip Christian <>
 Anthony A. Datri" <>

Sam Sampath      Tel: 914-945-1854    Tie: 8-862-1854
The Agora Project, IBM Research Division, Yorktown Heights, NY 10598

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