I've seen a few discussions of sysinstall vs disklabels, but this
problem looks a little different.
I sliced up a 37G disk with 4.7-RELEASE on ad0s1, Win2k on ad0s[23]
and ad0s4 empty. I installed grub-0.92, putting the bootloader in
the MBR and config files in ad0s1a. Everything worked fine.
Then I installed 5.0-RC1 on ad0s4. The next reboot, grub dumped me
at the prompt, saying that there were no BSD partitions on ad0s1.
It took a while to figure out the problem, but it seems that
installing 5.0-RC1 on slice 4 rewrote the disklabel on slice 1.
I wiped ad0s4 and reinstalled last night, saving the before and
after disklabels.
Here's ad0s1 (4.7):
# /dev/ad0s1c:
type: ESDI
disk: ad0s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 1621
sectors/unit: 26057367
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: 4194304 0 4.2BSD 0 0 0 # (Cyl. 0 - 261*)
b: 2097152 4194304 swap # (Cyl. 261*- 391*)
c: 26057367 0 unused 0 0 # (Cyl. 0 - 1621*)
e: 4194304 6291456 4.2BSD 0 0 0 # (Cyl. 391*- 652*)
f: 4194304 10485760 4.2BSD 0 0 0 # (Cyl. 652*- 913*)
g: 11377303 14680064 4.2BSD 0 0 0 # (Cyl. 913*- 1621*)
Here's ad0s4 (empty):
# /dev/ad0s4c:
type: ESDI
disk: ad0s4
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 1622
sectors/unit: 26057430
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]
c: 26057430 0 unused 0 0 # (Cyl. 0 - 1621)
And here's the config for sysinstall:
# disk format
disk=ad0
partition=existing
bootManager=none
diskPartitionEditor
# disk slices
ad0s4-1=ufs 4194304 / 1 # 2G + soft updates
ad0s4-2=swap 2097152 none # 1G
ad0s4-3=ufs 4194304 /var 1 # 2G + soft updates
ad0s4-4=ufs 4194304 /usr 1 # 2G + soft updates
ad0s4-5=ufs 0 /home 1 # free + soft updates
diskLabelEditor
# install system
distSetEverything
mediaSetCDROM
installCommit
# install packages
package=lynx-2.8.4.1c
packageAdd
package=sudo-1.6.6
packageAdd
After the installation, here's ad0s1 (4.7):
# /dev/ad0s1c:
type: ESDI
disk: ad0s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 1621
sectors/unit: 26057367
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: 4194304 0 unused 0 0 # (Cyl. 0 - 261*)
b: 2097152 4194304 unused 0 0 # (Cyl. 261*- 391*)
c: 26057367 0 unused 0 0 # (Cyl. 0 - 1621*)
e: 4194304 6291456 unused 0 0 # (Cyl. 391*- 652*)
f: 4194304 10485760 unused 0 0 # (Cyl. 652*- 913*)
g: 11377303 14680064 unused 0 0 # (Cyl. 913*- 1621*)
And ad0s4 (5.0-RC1):
# /dev/ad0s4c:
type: ESDI
disk: ad0s4
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 1622
sectors/unit: 26057430
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: 4194304 0 4.2BSD 0 0 0 # (Cyl. 0 - 261*)
b: 2097152 4194304 swap # (Cyl. 261*- 391*)
c: 26057430 0 unused 0 0 # (Cyl. 0 - 1621)
d: 4194304 6291456 4.2BSD 0 0 0 # (Cyl. 391*- 652*)
e: 4194304 10485760 4.2BSD 0 0 0 # (Cyl. 652*- 913*)
f: 11377366 14680064 4.2BSD 0 0 0 # (Cyl. 913*- 1621*)
Notice that all the fstype values on ad0s1 have changed to 'unused'
- this borks grub, because it can't find any FFS filesystems.
So I installed boot0 (which didn't have any problem with the missing
fstypes), rebooted into 4.7 and fixed things with disklabel -e.
Once grub could see BSD partitions, I reinstalled it in the MBR and
everything worked fine again.
Should an installation on one slice be changing things on another
slice? Or have I made an enormous blunder here?
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