Date: Wed, 17 Jun 2015 10:32:11 -0400 From: Paul Kraus <paul@kraus-haus.org> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: ZFS booting from MBR Question Message-ID: <5718BB29-A9E3-4551-807E-FB9575C1EA04@kraus-haus.org>
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I have an older system that did not want to boot from ZFS/GPT, so I =
installed it ZFS/MBR and it boots and runs fine, with one small =
exception. It is configured as a 4-way mirror (for read performance) but =
when the system boots it is clear that all of the parts of the boot =
loader are only installed on ONE of the four drives. I can watch it try =
to boot from each of the four drives and only succeeded from one of =
them. This is running 10.1 and I installed via bsdinstall and the =
ZFS-on-root option changing partition type from the ZFS Configuration =
screen. The error echoes to the console and confers not being able to =
find a zfs label, but zdb -l shows all 4 copies of the label intact on =
both part ions with zpools on them (bootpool and rootpool, yes, I use =
root pool instead of the FreeBSD default because I started with ZFS =
under Solaris in 2006 or so).
I have not been able to find any documentation for how to write all the =
components of the boot loader for ZFS/MBR manually. Does someone here =
know what bsdinstall is doing under the covers ?
I am assuming the issue is the phase 1 boot loader on ada<n>s1 =
partition, but am not sure how to write that correctly, and I am afraid =
of overwriting the one good one I have.
Relevant info below
root@m2:/dev # gpart show ada0
=3D> 63 976773105 ada0 MBR (466G)
63 976773105 1 freebsd [active] (466G)
root@m2:/dev # gpart show ada0s1
=3D> 0 976773105 ada0s1 BSD (466G)
0 4194304 1 freebsd-zfs (2.0G)
4194304 4194304 2 freebsd-swap (2.0G)
8388608 968384497 4 freebsd-zfs (462G)
root@m2:/dev # zpool status
pool: bootpool
state: ONLINE
scan: scrub repaired 0 in 0h1m with 0 errors on Wed Jun 10 03:07:15 =
2015
config:
NAME STATE READ WRITE CKSUM
bootpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ada0s1a ONLINE 0 0 0
ada1s1a ONLINE 0 0 0
ada2s1a ONLINE 0 0 0
ada3s1a ONLINE 0 0 0
errors: No known data errors
pool: rootpool
state: ONLINE
scan: scrub repaired 0 in 1h53m with 0 errors on Wed Jun 10 05:00:12 =
2015
config:
NAME STATE READ WRITE CKSUM
rootpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ada0s1d ONLINE 0 0 0
ada1s1d ONLINE 0 0 0
ada2s1d ONLINE 0 0 0
ada3s1d ONLINE 0 0 0
errors: No known data errors
root@m2:/dev # zfs list
NAME USED AVAIL REFER MOUNTPOINT
bootpool 502M 1.43G 501M /bootpool
rootpool 209G 237G 19K none
rootpool/ROOT 6.33G 237G 19K none
rootpool/ROOT/20150603 1K 237G 3.52G /
rootpool/ROOT/default 6.33G 237G 817M /
rootpool/software 3.63G 237G 3.63G /software
rootpool/tmp 104K 237G 104K /tmp
rootpool/usr 4.29G 237G 19K /usr
rootpool/usr/home 28K 237G 19K /usr/home
rootpool/usr/ports 3.94G 237G 3.00G /usr/ports
rootpool/usr/src 359M 237G 359M /usr/src
rootpool/var 194G 237G 19K /var
rootpool/var/crash 19K 237G 19K /var/crash
rootpool/var/log 42.4M 237G 400K /var/log
rootpool/var/mail 194G 237G 190G /var/mail
rootpool/var/spool 1.62M 237G 798K /var/spool
rootpool/var/tmp 19K 237G 19K /var/tmp
root@m2:/dev #=20
--
Paul Kraus
paul@kraus-haus.org
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