Date: Sun, 27 Aug 2000 18:45:28 -0700 From: "Kevin Oberman" <oberman@es.net> To: questions@freebsd.org Subject: Problems with dd (probably a disk labeling problem) Message-ID: <200008280145.e7S1jSU08497@ptavv.es.net>
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I have been trying to copy my root partition between identically sized
partitions on two drives. I do tried doing this "stand-alone' but got
a fixlabel error:
dscheck(#ad/0x20010): fixlabel: raw partition size > slice size
fixlabel: raw partition offset != slice offset
OK. I checked the disklabel and I had transposed two digits on the
offset for one partition. (I'm glad this brought it to my attention
before I destroyed something.) I fixed this and the disklabel seems to be
fine. I've re-calculated several times and the numbers all add up. But
I still get the same error from dd.
Here is the fdisk output for the device:
# fdisk ad2
******* Working on device /dev/ad2 *******
parameters extracted from in-core disklabel are:
cylinders=26473 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=26473 heads=16 sectors/track=63 (1008 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 26684721 (13029 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 1023/ sector 63/ head 15
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
And here is the disklabel output for the slice in question:
# /dev/ad2s1c:
type: ESDI
disk: ad2s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 26472
sectors/unit: 26684721
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 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 203*)
b: 417792 204800 swap # (Cyl. 203*- 617*)
c: 26684721 0 unused 0 0 # (Cyl. 0 - 26472*)
e: 10204000 622592 4.2BSD 1024 8192 16 # (Cyl. 617*- 10740*)
f: 15822129 10862592 4.2BSD 1024 8192 16 # (Cyl. 10776*- 26472*)
It all looks perfect to me. What am I missing?
FWIW, here is the partition information for the source slice:
# size offset fstype [fsize bsize bps/cpg]
a: 204800 0 4.2BSD 0 0 0 # (Cyl. 0 - 203*)
b: 417792 204800 swap # (Cyl. 203*- 617*)
c: 26687745 0 unused 0 0 # (Cyl. 0 - 26475*)
e: 10240000 622592 4.2BSD 1024 8192 16 # (Cyl. 617*- 10776*)
f: 15825153 10862592 4.2BSD 1024 8192 16 # (Cyl. 10776*- 26475*)
Looks about the same to me. I do wonder why fsize, bsize, and bps/cpg
are shown as 0 for this partition, though. I'd suspect this, but this
is my root partition and the system runs just fine. fsck finds nothing
wrong.
Any ideas what I could have done wrong?
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net Phone: +1 510 486-8634
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