[SUMMARY]: File System Compatibility (4.0D & 3.2c UFS)

From: Irene A. Shilikhina <irene_at_alpha.iae.nsk.su>
Date: Thu, 06 May 1999 11:08:14 +0700 (NSD)

Hello Managers,

yesterday I wrote that my attempt in mounting file systems created under
another version of the system had failed (with the message "Dirty file system").

Thanks to everybody who replied:

Olle Eriksson <olle_at_cb.uu.se>
Udo Grabowski <grabow_at_imk.fzk.de>
Cy Dewhurst <cy.dewhurst_at_rbch-tr.swest.nhs.uk>
Dr Marco Luchini <m.luchini_at_ic.ac.uk>
MC.Vialatte_at_custsv.univ-bpclermont.fr
"David A. Massaro - Unix, Linux, VMS, TCP/IP..."
     <MASSARDA_at_mail.suny.edu>
Sysadmin <sysadmin_at_tatatel.co.in>
Gyula Szokoly <szgyula_at_tarkus.pha.jhu.edu>
"Alan Rollow - Dr. File System's Home for Wayward Inodes."
     <alan_at_nabeth.cxo.dec.com>
"Picard, Roger" <Roger.Picard_at_compaq.com>
"Dr. Tom Blinn, 603-884-0646" <tpb_at_doctor.zk3.dec.com>
Jim Bostwick <Jim_Bostwick_at_cargill.com>

The answer by Dr. Tom Blinn deservs to be awarded a prise for laconism:
                    ***********************************
                    * Read the "fsck" reference page. *
                    ***********************************

My special thanks to Alan Rollow for an extra information:

>Run fsck on the file system before trying to mount it. When a file
>system is mounted on any version, a field is changed in the super-
>block to indicate that the file system has changed. When the file
>system is unmounted, the field is cleared and the file system is
>clean. Mount and fsck use this flag to determine whether the file
>system needs to be checked or that it be corrupt; if the system
>crashed before a reboot, the field won't have been cleared. The
>root can never be unmounted cleanly, so it always has to be
>checked.

My comment:
   since there is such a string in the /sbin/rc0 file:

   /sbin/umount -a 2> /dev/null ,

   I'll try "init s" instead of shutdown (in order to fight against the cause
   rather than a consequence, and keeping in mind that the / file system
   is always mentioned in /etc/fstab). I have to delay the experiment until
   weekend.

So, the matter does not concern the version of the system.
All of those who answered mentioned fsck. My original mail is at the end of
the message.

Thanks again,
Irene
*************************************************************************
* *
* Irene A. Shilikhina e-mail: irene_at_alpha.iae.nsk.su *
* System administrator, *
* Institute of Automation & Electrometry, *
* Siberian Branch of Russian Academy of Sciences, *
* Novosibirsk, Russia *
* http://www.iae.nsk.su/~irene *
*************************************************************************
* * *
* The road to hell is paved with * Every cloud has a silver lining. *
* good intentions. * *
* * *
*************************************************************************

On Wed, 5 May 1999, Irene A. Shilikhina wrote:

>
> Hello Managers,
>
> I've just installed 4.0D from scratch, ang now I'm in the phase of settling
> all necessary things before commitment it to the users. So both systems are
> able to boot from different disks now. To make this process easier, I'd like
> to mount the file systems created under 3.2c when running the new system.
> I'm only able to make it with one of the two disks - that with /usr2 file
> system (this drive is an IBM's and with no disklabel at all). As to the
> other one, with / and /usr file systems (a DEC's drive, originally shipped
> with 3.2c FIS, and of course with a disklabel), neither of that file systems
> won't do it with such an error in mounting: Dirty file system. In fact,
> everything is all right with this disk since under 3.2c it has been working
> well.
>
> On the other hand, when I try to mount the disk with the newinstalled 4.0D
> (non-DEC's drive) under 3.2c, it's a success if only it concerns /usr on
> /dev/rz1g but fails with /dev/rz1a - with the same message: Dirty file system.
>
> Neither Release Notes nor the archive have helped me out.
>
> Thanks,
> Irene
Received on Thu May 06 1999 - 04:15:19 NZST

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