Date: Sun, 23 Oct 2011 11:26:29 +0200 From: James Coldwell <coldwelljames11@googlemail.com> To: freebsd-fs@freebsd.org Subject: Restore a ZFS mirror setup (GPT, ZFS-on-root) Message-ID: <CAJWXFzNDn%2B6%2B0zoXFECk=1Jd7gOPWfKqJzKGA6PQjxhjA=D-Yw@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hello List,
My Problem:
My server wouldn't come back up after a reboot.
It is a 8.2-RELEASE system, running a two-disk ZFS mirror setup.
It is a dedicated box in a remote datacenter.
I can boot up some linux-based rescue system.
The way I installed FreeBSD on it was with mfsbsd, the zpool was
created as such:
=A0=A0=A0 set poolname=3D"z0"
=A0=A0=A0 set dev1=3D"ad4"
=A0=A0=A0 set dev2=3D"ad6"
=A0=A0=A0 set swapsize=3D"4G"
=A0=A0=A0 set zfssize=3D"300G"
=A0=A0=A0 gpart delete -i 1 ${dev1}
=A0=A0=A0 gpart delete -i 1 ${dev2}
=A0=A0=A0 gpart destroy ${dev1}
=A0=A0=A0 gpart destroy ${dev2}
=A0=A0=A0 gpart create -s gpt ${dev1}
=A0=A0=A0 gpart create -s gpt ${dev2}
=A0=A0=A0 gpart add -b 34 -s 64k -t freebsd-boot ${dev1}
=A0=A0=A0 gpart add -s ${swapsize} -t freebsd-swap -l swap0 ${dev1}
=A0=A0=A0 gpart add -s ${zfssize} -t freebsd-zfs -l disk0 ${dev1}
=A0=A0=A0 gpart add -b 34 -s 64k -t freebsd-boot ${dev2}
=A0=A0=A0 gpart add -s ${swapsize} -t freebsd-swap -l swap1 ${dev2}
=A0=A0=A0 gpart add -s ${zfssize} -t freebsd-zfs -l disk1 ${dev2}
=A0=A0=A0 gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ${dev1}
=A0=A0=A0 gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ${dev2}
=A0=A0=A0 zpool create ${poolname} mirror /dev/gpt/disk0 /dev/gpt/disk1
That worked perfectly for half a year.
Suddenly, it wouldn't come back up after a reboot.
What I want to do now is mount the filesystem and check for misconfiguratio=
n.
So I once again booted into the linux-based rescue system, dd'd mfsbsd
onto the first disk (/dev/sda), booted it up.
This FreeBSD-based system is called "prealpha".
That's where I am now:
=A0=A0=A0 prealpha# gpart show
=A0=A0=A0 =3D>=A0=A0=A0=A0=A0=A0=A0 0=A0 976773168=A0 ada0=A0 BSD=A0 (466G)
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0=A0=A0=A0=A0=A0=A0=A0 16=A0=A0=A0=
=A0=A0=A0=A0 - free -=A0 (8.0K)
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0=A0 16=A0=A0=A0=A0=A0 65520=A0=A0=A0=A0 1=A0=
!0=A0 (32M)
=A0=A0=A0 =A0=A0=A0=A0=A0 65536=A0 976707632=A0=A0=A0=A0=A0=A0=A0 - free -=
=A0 (466G)
=A0=A0=A0 =3D>=A0=A0=A0=A0=A0=A0 34=A0 976773101=A0 ada1=A0 GPT=A0 (466G)
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0=A0 34=A0=A0=A0=A0=A0=A0=A0 128=A0=A0=A0=A0 =
1=A0 freebsd-boot=A0 (64K)
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0 162=A0=A0=A0 8388608=A0=A0=A0=A0 2=A0 freeb=
sd-swap=A0 (4.0G)
=A0=A0=A0 =A0=A0=A0 8388770=A0 629145600=A0=A0=A0=A0 3=A0 freebsd-zfs=A0 (3=
00G)
=A0=A0=A0 =A0 637534370=A0 339238765=A0=A0=A0=A0=A0=A0=A0 - free -=A0 (162G=
)
=A0=A0=A0 prealpha# ls /dev/gpt/
=A0=A0=A0 disk1=A0=A0=A0 swap1
The devices changed name from ad4/ad6 to ada0/ada1 because mfsbsd
loads the ahci module now.
I want to mount the zpool from ada1, and view/edit some configuration files=
.
After that, I want to restore the mirror setup with ada0 and ada1 and
try to boot again.
How do I do that?
Any help would be appreciated, I probably forgot to mention vital
details, I am in a bit of a panic right now.
Please tell me if you need for details.
James
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJWXFzNDn%2B6%2B0zoXFECk=1Jd7gOPWfKqJzKGA6PQjxhjA=D-Yw>