Date: Mon, 27 Nov 2000 13:09:11 -0800 From: "Crist J . Clark" <cjclark@reflexnet.net> To: freebsd-questions@freebsd.org Subject: Refreshing Kernel Slice Table w/o Rebooting Message-ID: <20001127130911.A79675@149.211.6.64.reflexcom.com>
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I think I asked this once before but never got a response. Is there a
way to refresh the in-kernel slice table without rebooting?
I just resliced a disk on a running machine. Basically, I had set
aside some space for other OSes when I first set up the box a few
months ago. However, the role of the machine has changed and now I
might as well (need to, actually) give all of the space to FreeBSD. I
didn't touch slice 1, ad0s1, where FreeBSD lives, but expanded slice 2
to eat the whole disk and nuked slices 3 and 4.
Here is the old table,
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=622 heads=255 sectors/track=63 (16065 blks/cyl)
parameters to be used for BIOS calculations are:
cylinders=622 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 4996152 (2439 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 310/ sector 63/ head 254
The data for partition 2 is:
sysid 130,(Linux swap or Solaris x86)
start 4996215, size 192780 (94 Meg), flag 0
beg: cyl 311/ sector 1/ head 0;
end: cyl 322/ sector 63/ head 254
The data for partition 3 is:
sysid 131,(Linux filesystem)
start 5188995, size 401625 (196 Meg), flag 0
beg: cyl 323/ sector 1/ head 0;
end: cyl 347/ sector 63/ head 254
The data for partition 4 is:
sysid 131,(Linux filesystem)
start 5590620, size 4401810 (2149 Meg), flag 0
beg: cyl 348/ sector 1/ head 0;
end: cyl 621/ sector 63/ head 254
And the new,
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=622 heads=255 sectors/track=63 (16065 blks/cyl)
parameters to be used for BIOS calculations are:
cylinders=622 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 4996152 (2439 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 310/ sector 63/ head 254
The data for partition 2 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 4996215, size 4996215 (2439 Meg), flag 0
beg: cyl 311/ sector 1/ head 0;
end: cyl 621/ sector 63/ head 254
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
After I did the reslice, I wanted to put a FreeBSD disklabel on the
new slice so I ran,
# disklabel -r -w ad0s2 auto
Which succeded with no errors, but when I check the label,
# disklabel ad0s2
# /dev/ad0s2:
type: ESDI
disk: ad0s2
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 12
sectors/unit: 192780
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: 192780 0 unused 0 0 # (Cyl. 0 - 11)
We see this is a lot smaller than the new big slice. If we examine
more closely, we see that this is what we would have expected for the
_old_ slice 2.
If I try manually edit the label to the new size I get,
# disklabel -e ad0s2
disklabel: No space left on device
re-edit the label? [y]:
I cannot write the correct label to the disk. It seems the kernel
remembers the old slice table, and I can't figure out how to load the
new one in there. I had this problem once in the past, but it was just
an annoyance since rebooting that machine was no problem. Rebooting
this machine is a pain since it has some things I'd rather not
interupt running.
Any solutions or workarounds?
--
Crist J. Clark cjclark@alum.mit.edu
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