Date: Mon, 27 Feb 2012 14:50:08 GMT From: Gavin Mu <gavin.mu@gmail.com> To: freebsd-sparc64@FreeBSD.org Subject: Re: sparc64/165025: [PATCH] zfsboot support for sparc64 Message-ID: <201202271450.q1REo80o002752@freefall.freebsd.org>
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The following reply was made to PR sparc64/165025; it has been noted by GNATS.
From: Gavin Mu <gavin.mu@gmail.com>
To: bug-followup@freebsd.org
Cc: Kurt Lidl <lidl@pix.net>, Marius Strobl <marius@alchemy.franken.de>
Subject: Re: sparc64/165025: [PATCH] zfsboot support for sparc64
Date: Mon, 27 Feb 2012 22:46:22 +0800
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Here is the updated patch to support zfs boot fully. Now boot from
mirror/raidz pool are also supported.
zfsboot is the enhancement of boot1. Instead of reading "/boot/loader"
from UFS filesystem, it loads the ELF "zfsloader" program from the
3.5MB Boot Block of zpool in current vtoc8 partition (slice).
zfsloader tries to probe the zpool in current vtoc8 partition and if
it is valid, it records the guid, then search all disks to find all
zpools in the vtoc8 partitions with freebsd-zfs tag. zfsloader uses
devalias "disk<n>" to find the disks, so devalias must be defined for
all your bootable disks by OBP (aka. {ok} mode). then it boots from
the zpool with the same guid.
If you use the whole disk as zpool, you can allocate all disk space
into the first vtoc8 partition (for example, ada0a in FreeBSD) tag
with freebsd-zfs to create zpool. It is same with creating zpool on
the whole disk (ada0).
For reading from multiple disks, some ofw code are changed. The former
code does not work when reading from multiple disks and I am not sure
if it is possible and how to do this. (I googled but did not find more
useful things). So I changed the code to close the current disk before
a new disk is opened, and there will be only one disk opened
simultaneously. I am not sure if this will slow the disk reading for
booting from raidz pool. (It is several minutes slow on my V100
machine to boot from raidz zpool).
Steps to use zfs boot:
1. create vtoc8
# gpart create -s vtoc8 ada0
2. add partitions, for example
# gpart add -t freebsd-swap -s 4g ada0
# gpart add -t freebsd-zfs ada0
the disk will be:
# gpart show
=> 0 78156480 ada0 VTOC8 (37G)
0 8388480 1 freebsd-swap (4G)
8388480 69768000 2 freebsd-zfs (33G)
3. create zpool
# zpool create tank ada0b
or if you use mirrored/raidz type:
# zpool create tank mirror ada0b ada1b
# zpool create tank raidz ada0b ada1b ada2b....
4. write boot1
# gpart bootcode -p /boot/boot1 -i 1 ada0
5. write zfsloader into ZFS Boot Block, currently there is no dedicate
program to do this, so use dd instead.
# dd if=./zfsloader of=/dev/ada0b bs=512 oseek=1024 conv=notrunc
only one copy of boot1 and zfsloader is needed to boot even if you use
mirror/raidz pool. surely you can write copies on each disk then you
can boot from another disk when disk failure.
6. install system on the zpool...
7. now the system can be booted with:
{1} ok boot disk0:b
if you defined devalias
{1} ok devalias disk0
disk0 /pci@1c,600000/ide@2/disk@0,0
If you use mirrored or raidz type of zpool, do not forget to define
devalias for all used disks.
The only flaw of this zfs boot support for sparc64 is the lack of a
dedicate program to write zfsloader into ZFS Boot Block. Surely we
still can use dd to do this simply.
I do not think gpart is suitable to do such thing. Maybe it is
reasonable to have a command like:
# zpool installboot ./zfsloader tank
But such a command will be used only by sparc64 architecture since
other architectures does not use ZFS Boot Block.
Cheers,
Gavin Mu
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