My original question was:
> My AlphaStation 400 4/233 gives me the following messages when doing a file
> system check at bootup
>
> /sbin/ufs_fsck -p
> /dev/rrz0a SUMMARY INFORMATION BAD(SALVAGED)
> /dev/rrz0g SUMMARY INFORMATION BAD(SALVAGED)
> the other disks check out OK
>
> The message appears even if I boot twice in sucession. Can anyone explain
> what is going on. Should I be worried, the machine seems to function just
> fine.
Received two very prompt responses
From: "Dr. Tom Blinn, 603-881-0646" <tpb_at_zk3.dec.com>
>From alan_at_nabeth.cxo.dec.com Fri Mar 8 12:43:29 1996
Many thanks.
>From alan_at_nabeth.cxo.dec.com Fri Mar 8 12:43:29 1996
The "SUMMARY INFORMATION" referred to is the cylinder group summary
data. Each cylinder group maintains information about how much
free space and free inodes it has. A small amount of space is set
aside in the first cylinder group to summarize the information for
all the cylinder groups. Without recent Digital UNIX sources to
look at I'd guess that fsck compares the individual cylinder group
data with the summary and if it doesn't match, prints the message
and updates the summary.
When a file system is unmounted, the cylinder group information should
be collected and a new summary written. This is probably one of the
last things done before the umount is complete. I would guess that a
process is holding open the file system on rz0g and it doesn't get
correctly dismounted before the system halts. For the root, it doesn't
get unmounted, but should have the summary updated.
Possible causes are:
1. A bug in the shutdown that doesn't let a process die gracefully
before halting the system.
2. A local problem in the shutdown that some process can't die
gracefully before halting the system.
If it is a bug, there may be patch.
From: "Dr. Tom Blinn, 603-881-0646" <tpb_at_zk3.dec.com>
In a UFS file system, the summary information will always be out of sync
(bad) unless the file system is unmounted cleanly. I assume that /dev/rrz0a
is your root file system, which will never get unmounted if you booted from
it, and /dev/rrz0g is your /usr file system, which may or may not actually
get unmounted cleanly before the system shuts down. (I am assuming here
that you use shutdown -h or shutdown -r to shut the system down, rather than
just manually sync-ing the disks and using halt.)
You should not be worried unless you see real errors from fsck, in which
case you would not have the system just come up to multi-user mode.
Tom
Dr. Thomas P. Blinn, UNIX Software Group, Digital Equipment Corporation
110 Spit Brook Road, MS ZKO3-2/U20 Nashua, New Hampshire 03062-2698
Technology Partnership Engineering Phone: (603) 881-0646
Internet: tpb_at_zk3.dec.com Digital's Easynet: alpha::tpb
Worry kills more people than work because more people worry than work.
My favorite palindrome is: Satan, oscillate my metallic sonatas.
-- Phil Agre, pagre_at_ucsd.edu
Opinions expressed herein are my own, and do not necessarily represent
those of my employer or anyone else, living or dead, real or imagined.
--
------------------------------
Robert Munn |
Room 1132F |
Main Administration Building |
University of Maryland |
College Park |
Maryland 20742 |
Phone: (301) 405-6859 |
------------------------------
Received on Tue Mar 12 1996 - 22:16:36 NZDT