ZFS booting without partitions

Mon Jun 1 10:27:14 UTC 2009

Henri Hennebert wrote:
> Lorenzo Perone wrote:
>> Hi,
>>
>> I tried hard... but without success ;(
>>
>> the result is, when choosing the disk with the zfs boot
>> sectors in it (in my case F5, which goes to ad6), the kernel
>> is not found. the console shows:
>>
>> forth not found
>> definitions not found
>> only not found
>> (the above repeated several times)
> 
> This is the file /boot/loader from 7.2-STABLE which is wrong.
> 
> You can find a copy from 8.0-CURRENT and a script that I tested on a USB 
> key) and is running for me:
> 
> http://verbier.restart.be/xfer/boot-zfs/
> 
> Put this directory somewhere, eg /tmp/boot-zfs
> 
> and run the script eg:
> `cd /tmp/boot-zfs && sh -x make_usb_key.sh da6 kingston`
> 
> good luck

CAVEAT:

The script put tuning in '/boot/loader.conf' wich imply "options 
  KVA_PAGES=384" in my i386 kernel.

Henri

> 
> Henri
>>
>> can't load 'kernel'
>>
>> and I get thrown to the loader prompt.
>> lsdev does not show any ZFS devices.
>>
>> Strange thing: if I boot from the other disk, F1, which is my
>> ad4 containing the normal ufs system I used to make up the other
>> one, and escape to the loader prompt, lsdev actually sees the
>> zpool which is on the other disk, and shows:
>> zfs0: tank
>>
>> I tried booting with boot zfs:tank or zfs:tank:/boot/kernel/kernel,
>> but there I get the panic: free: guard1 fail message.
>> (would boot zfs:tank:/boot/kernel/kernel be correct, anyways?)
>>
>> Sure I'm doing something wrong, but what...? Is it a problem that
>> the pool is made out of the second disk only (ad6)?
>>
>> Here are my details (note: latest stable and biosdisk.c merged
>> with changes shown in r185095. no problems in buildworld/kernel):
>>
>> <snip>
>>
>> Machine: p4 4GHz 4 GB RAM (i386)
>>
>> Note: the pool has actually a different name (heidi
>> instead of tank, if this can be of any relevance...),
>> just using tank here as it's one of the conventions...
>>
>> mount (just to show my starting situation)
>>
>> /dev/mirror/gm0s1a on / (ufs, local)
>> devfs on /dev (devfs, local)
>> /dev/mirror/gm0s1e on /tmp (ufs, local, soft-updates)
>> /dev/mirror/gm0s1f on /usr (ufs, local, soft-updates)
>> /dev/mirror/gm0s1d on /var (ufs, local, soft-updates)
>>
>> gmirror status
>>       Name    Status  Components
>> mirror/gm0  DEGRADED  ad4
>> (ad6 used to be the second disk...)
>>
>> echo 'LOADER_ZFS_SUPPORT=yes' >> /etc/make.conf
>>
>> cd /usr/src
>> make buildworld && make buildkernel KERNCONF=HEIDI
>> make installkernel KERNCONF=HEIDI
>> mergemaster
>> make installworld
>> shutdown -r now
>>
>> dd if=/dev/zero of=/dev/ad6 bs=512 count=32
>>
>> zpool create tank ad6
>> zfs create tank/usr
>> zfs create tank/var
>> zfs create -V 4gb tank/swap
>> zfs set org.freebsd:swap=on tank/swap
>> zpool set bootfs=tank tank
>>
>> rsync -avx / /tank
>> rsync -avx /usr/ /tank/usr
>> rsync -avx /var/ /tank/var
>> cd /usr/src
>> make installkernel KERNCONF=HEIDI DESTDIR=/tank
>>
>> zpool export tank
>>
>> dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1
>> dd if=/boot/zfsboot of=/dev/ad6 bs=512 skip=1 seek=1024
>>
>> zpool import tank
>>
>> zfs set mountpoint=legacy tank
>> zfs set mountpoint=/usr tank/usr
>> zfs set mountpoint=/var tank/var
>>
>> shutdown -r now ...
>>
>> at the 'mbr prompt' I pressed F5 (the second disk, ad6)
>> .. as written above, loader gets loaded (at this stage
>> I suppose it's the stuff dd't after block 1024?),
>> but kernel not found.
>>
>> /usr/src/sys/i386/conf/HEIDI:
>> (among other things...):
>> options KVA_PAGES=512
>>
>> (/tank)/boot/loader.conf:
>> vm.kmem_size="1024M"
>> vm.kmem_size_max="1024M"
>> vfs.zfs.arc_max="128M"
>> vfs.zfs.vdev.cache.size="8M"
>> vfs.root.mountfrom="zfs:tank"
>>
>> (/tank)/etc/fstab:
>> # Device        Mountpoint    FStype    Options        Dump    Pass#
>> tank        /        zfs    rw        0    0
>> /dev/acd0        /cdrom        cd9660    ro,noauto    0    0
>>
>> </snap>
>>
>> any help is welcome... don't know where to go from here right now.
>>
>> BTW: I can't stop thanking the team for the incredible
>> pace at which bugs are fixed these days!
>>
>>
>> Regards,
>>
>> Lorenzo
>>
>>
>>
>> On 26.05.2009, at 18:42, George Hartzell wrote:
>>
>>> Andriy Gapon writes:
>>>> on 26/05/2009 19:21 George Hartzell said the following:
>>>>> Dmitry Morozovsky writes:
>>>>>> On Tue, 26 May 2009, Mickael MAILLOT wrote:
>>>>>>
>>>>>> MM> Hi,
>>>>>> MM>
>>>>>> MM> i prefere use zfsboot boot sector, an example is better than a 
>>>>>> long talk:
>>>>>> MM>
>>>>>> MM> $ zpool create tank mirror ad4 ad6
>>>>>> MM> $ zpool export tank
>>>>>> MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1
>>>>>> MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1
>>>>>> MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1  seek=1024
>>>>>> MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1  seek=1024
>>>>>>
>>>>>> s/skeep/skip/ ? ;-)
>>>>>
>>>>> What is the reason for copying zfsboot one bit at a time, as opposed
>>>>> to
>>>>>
>>>>>  dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2
>>>>
>>>> seek=1024 for the second part? and no 'count=1' for it? :-)
>>>>
>>>> [Just guessing] Apparently the first block of zfsboot is some form 
>>>> of MBR and the
>>>> rest is zfs-specific code that goes to magical sector 1024.
>>>
>>> Ok, I managed to read the argument to seek as "one block", apparently
>>> my coffee hasn't hit yet.
>>>
>>> I'm still confused about the two parts of zfsboot and what's magical
>>> about seeking to 1024.
>>>
>>> g.
>>>
>>> _______________________________________________
>>> freebsd-stable at freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
>>> To unsubscribe, send any mail to 
>>> "freebsd-stable-unsubscribe at freebsd.org"
>>
>> _______________________________________________
>> freebsd-stable at freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
>> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
> 
> _______________________________________________
> freebsd-stable at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"