Date: Mon, 3 Apr 1995 18:05:37 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hackers@FreeBSD.org Subject: MBR corruption again Message-ID: <199504031605.SAA10033@labinfo.iet.unipi.it>
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Once again I experienced MBR corruption on a snap950210 system, with
the entire disk dedicated to FreeBSD. It usually happens when the
machine (which is configured as a Firewall) is up for a few days (it
is *very* stable, I have to say), and what I see after I do a reboot
is random data on the partition table.
The parameters for the disk are:
studenti%~# fdisk
******* Working on device /dev/rwd0d *******
parameters extracted from in-core disklabel are:
cylinders=1048 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=1048 heads=16 sectors/track=63 (1008 blks/cyl)
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 0 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 0, size 1056384 (515 Meg), flag 80
beg: cyl 0/ sector 1/ head 0;
end: cyl 1023/ sector 63/ head 15
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
studenti%~# disklabel wd0
# /dev/rwd0c:
type: ST506
disk: ESDI/IDE
label: MBR based label
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 1048
rpm: 0
interleave: 0
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 61440 0 4.2BSD 0 0 0 # (Cyl. 0 - 60*)
b: 131072 61440 swap # (Cyl. 60*- 190*)
c: 1056384 0 unused 0 0 # (Cyl. 0 - 1047)
d: 1056384 0 unused 0 0 # (Cyl. 0 - 1047)
e: 863872 192512 4.2BSD 0 0 0 # (Cyl. 190*- 1047*)
Warning, revolutions/minute 0
super block size 0
Any ideas, other than upgrading the system (which is what I'll do
anyways) ?
Thanks
Luigi
====================================================================
Luigi Rizzo Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it Universita' di Pisa
tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522
====================================================================
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