Date: Tue, 12 Jun 2001 11:40:13 -0400 From: Mark Thomas <thomas@pbegames.com> To: freebsd-questions@freebsd.org Subject: Disk disaster recovery Message-ID: <5.1.0.14.2.20010612113526.02295800@pbegames.com>
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[Apologies if you see this twice. I accidentally sent to stable first.]
[Probably more of a questions issue.]
Well, I think I've managed to do something incredibly stupid here.
This AM I moved an Adaptec 2940U adapter over to my 4.2S FBSD development machine with the intent of using a SCSI Jaz for backups. I also moved over a SCSI drive which is configured as a bootable 3.2S FBSD drive. The original system had a single 10GB IDE drive running a close to default partitions (/ /var swap /usr).
The first time I rebooted with the new hardware I accidentally booted off of the old SCSI drive. I hit reset (ick), turned off the BIOS on the SCSI controller and rebooted from the IDE. This time the machine booted off of the correct drive, but reported problems with ad0s1f (/usr). I'm fairly sure the old 3.2S SCSI drive was installed dangerously dedicated. I MAY have answered Y to a fsck prompt here concerning /dev/ad0s1f. :(
Did wd possibly hose my ad large disk?
I would REALLY like to recover data from this partition (Note to self: backup before adding hardware, especially when adding backup hardware).
I've now pulled the SCSI drives off temporarily. I can boot into single user mode. Below is as much relevent information as I can come up with (typing by hand, so somewhat truncated). If anyone has any method for recovering this data, I would greatly appreciate the help! Any further information I can provide, just ask.
dmesg:
FreeBSD 4.2-STABLE #0: Mon Feb 12...
CPU: Pentium II/Pentium II Xeon/Celeron (400 ...)
...
ahc0: <Adaptec 2940A Ultra SCSI adapter> ...
ad0: 9641MB <Maxtor 51024U2> [19590/16/63] at ata0-master UDMA33
acd0: CDROM <ATAPI CDROM> at ata1-master using PIO4
Waiting 15 seconds for SCSI...
Mounting root from ufs:/dev/ad0s1a
ad0: raw partition size != slice size
ad0: start 63, end 8385929, size 8385867
ad0c: start 63, end 19746719, size 19746657
ad0: truncating raw partition
ad0: rejecting partition in BSD label: it isn't entirely within the slice
ad0: start 63, end 8385929, size 8385867
adf0: start 1458239, end 19746719, size 18288481
fixlabel: raw partition size > slice size
fsck -n:
** /dev/ad0s1f (NO WRITE)
CANNOT READ: BLK 16
CONTINUE? yes
THE FOLLOWING DISK SECTORS COULD NOT BE READ: 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
/dev/ad0s1f: NOT LABELED AS A BSD FILE SYSTEM (unused)
(All other partitions OK)
disklabel -r /dev/rad0c:
type: ESDI
disk: ad0s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 19589
sectors/unit: 19746657
rpm: 3600
interleave: 1
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: 204800 63 4.2BSD 1024 8192 16 # (cyl. 0*-203*)
b: 1048576 204863 swap # (cyl. 203*-1243*)
c: 19746657 63 unused 0 # (cyl. 0*-19589*)
e: 204800 1253439 4.2BSD 1024 8192 16 # (cyl. 1243*-1446*)
f: 18288481 1458239 4.2BSD 1024 8192 16 # (cyl. 1446*-19589*)
partition c: partition extends past end of unit
partition f: partition extends past end of unit
fdisk reports:
parameters extracted from in-core disklabel are:
cylinders=1229 heads=255 sectors/track=63 (16065 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=1229 heads=255 sectors/track=63 (16065 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 63, size 8385867 (4094 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 521/ sector 63/ head 254
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
Mark
---
thomas@pbegames.com -------------> http://www.pbegames.com/~thomas
Play by Electron Games ----------> http://www.pbegames.com
[TM4463-ORG]
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