Date: Sat, 26 Mar 2005 12:48:35 +0000 From: Josef Karthauser <joe@tao.org.uk> To: stable@freebsd.org Subject: geom mirror Message-ID: <20050326124835.GA60924@genius.tao.org.uk>
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I'm trying to get a geom mirror up and running on a remote server across
two ide drives using the recipe below. I get as far as booting onto
the second ide drive using=20
1:ad(1,a)/boot/loader
at the boot block. The boot block complains that ad1 doesn't contain a
valid label however and refuses to boot.
There appears to be a valid label on the gm0 device:
jonah# disklabel mirror/gm0s1
# /dev/mirror/gm0s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 2097152 0 4.2BSD 2048 16384 28552=20
b: 6291456 2097152 swap =20
c: 240121664 0 unused 0 0 # "raw" part,
don't edit
d: 41943040 8388608 4.2BSD 2048 16384 28552=20
e: 41943040 50331648 4.2BSD 2048 16384 28552=20
f: 20971520 92274688 4.2BSD 2048 16384 28552=20
g: 84932416 113246208 4.2BSD 2048 16384 28552=20
h: 41943040 198178624 4.2BSD 2048 16384 28552=20
and there does appear to be an error on the ad1s1:
jonah# disklabel ad1s1
# /dev/ad1s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 2097152 0 4.2BSD 2048 16384 28552=20
b: 6291456 2097152 swap =20
c: 240121664 0 unused 0 0 # "raw" part,
don't edit
d: 41943040 8388608 4.2BSD 2048 16384 28552=20
e: 41943040 50331648 4.2BSD 2048 16384 28552=20
f: 20971520 92274688 4.2BSD 2048 16384 28552=20
g: 84932416 113246208 4.2BSD 2048 16384 28552=20
h: 41943040 198178624 4.2BSD 2048 16384 28552=20
disklabel: partition c doesn't cover the whole unit!
disklabel: An incorrect partition c may cause problems for standard
system utilities
Is this to be expected? What have I done wrong?
Regards,
Joe
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
# make sure the second disk is treated as a really fresh one
# (not really necessary, but makes procedure more deterministically ;-)
dd if=3D/dev/zero of=3D/dev/ad1 bs=3D512 count=3D79
# place a PC MBR onto the second disk
# (with a single FreeBSD slice /dev/mirror/gm0s1 as large as the
# /dev/ad0s1)
# either automatically if sizes fit...
fdisk -v -B -I /dev/ad1
# ...or manually to make sure the sizes fit:
size=3D`fdisk ad0 | grep ', size ' | head -1 | sed -e 's;^.*size
\([0-9]*\).*$;\1;'`
# ...and reduce the size by one block because ad0 and ad0s1 else would
# share the same last sector which could lead to ad0 be recognized as
# the GEOM provider instead of ad0s1. Alternatively, you can keep ad0
# and ad0s1 of the same size and hard-code the ad0s1 GEOM provider by
# adding the -h option to the "gmirror label" command below.
size=3D`expr $size - 1`
(echo "p 1 165 63 $size"; echo "a 1") | fdisk -v -B -f- -i /dev/ad1
# place a GEOM mirror label onto first slice of second disk
# (actually on the last block of the disk slice)
gmirror label -v -n -b round-robin gm0s1 /dev/ad1s1
# activate GEOM mirror kernel layer
# (makes the /dev/mirror/gm0s1 device available)
gmirror load
# place a BSD disklabel onto /dev/mirror/gm0s1
# (ATTENTION: in FreeBSD 5-STABLE before 14-Jan-2005 the
# /dev/mirror/gm0s1 device has to be specified as just "mirror/gm0s1" or
# the bsdlabel(8) will use the incorrect GEOM name "gm0s1" instead!)
# (NOTICE: figure out what partitions you want with "bsdlabel /dev/ad0"
# before)
# (NOTICE: start "a" partition at offset 16, "c" partition at offset 0)
bsdlabel -w -B /dev/mirror/gm0s1 # initialize
bsdlabel -e /dev/mirror/gm0s1 # create custom partitions
# manually copy filesystem data from first to to second disk
# (same procedure for partitions "g", etc)
newfs -U /dev/mirror/gm0s1a
mount /dev/mirror/gm0s1a /mnt
dump -L -0 -f- / | (cd /mnt; restore -r -v -f-)
newfs -U /dev/mirror/gm0s1d
mount /dev/mirror/gm0s1d /mnt/var
dump -L -0 -f- /var | (cd /mnt/var; restore -r -v -f-)
newfs -U /dev/mirror/gm0s1e
mount /dev/mirror/gm0s1e /mnt/usr
dump -L -0 -f- /usr | (cd /mnt/usr; restore -r -v -f-)
# adjust new system configuration for GEOM mirror based setup
cp -p /mnt/etc/fstab /mnt/etc/fstab.orig
sed -e 's/dev\/ad0s1/dev\/mirror\/gm0s1/g' </mnt/etc/fstab.orig
>/mnt/etc/fstab
echo 'swapoff=3D"YES"' >>/mnt/etc/rc.conf # for 5.3-RELEASE only
echo 'geom_mirror_load=3D"YES"' >>/mnt/boot/loader.conf
# instruct boot stage 2 loader on first disk to boot
# with the boot stage 3 loader from the second disk
# (mainly because BIOS might not allow easy booting from second ATA disk
# or at least requires manual intervention on the console)
echo "1:ad(1,a)/boot/loader" >/boot.config
# reboot system
# (for running system with GEOM mirror on second disk)
shutdown -r now
# make sure the first disk is treated as a really fresh one
# (also not really necessary, but makes procedure more deterministically
# ;-)
dd if=3D/dev/zero of=3D/dev/ad0 bs=3D512 count=3D79
# place a new PC MBR onto the first disk
# (with a single FreeBSD slice /dev/ad0s1 _exactly_ as large as the
# /dev/ad1s1)
size=3D`fdisk ad1 | grep ', size ' | head -1 | sed -e 's;^.*size
\([0-9]*\).*$;\1;'`
(echo "p 1 165 63 $size"; echo "a 1") | fdisk -v -B -f- -i /dev/ad0
# switch GEOM mirror to auto-synchronization and add first disk
# (first disk is now immediately synchronized with the second disk
# content)
gmirror configure -a gm0s1
gmirror insert gm0s1 /dev/ad0s1
# wait for the GEOM mirror synchronization to complete
sh -c 'while [ ".`gmirror list | grep SYNCHRONIZING`" !=3D . ]; do sleep
1; done'
# reboot into the final two-disk GEOM mirror setup
# (now actually boots with the MBR and boot stages on first disk
# as it was synchronized from second disk)
shutdown -r now
--=20
Josef Karthauser (joe@tao.org.uk) http://www.josef-k.net/
FreeBSD (cvs meister, admin and hacker) http://www.uk.FreeBSD.org/
Physics Particle Theory (student) http://www.pact.cpes.sussex.ac.uk/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D An eclectic mix of fact an=
d theory. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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