zfs discuss - Dec 2009 - How to destroy your system in funny way with ZFS

Hi all,

I installed another OpenSolaris (snv_129) in VirtualBox 3.1.0 on Windows because
snv_130 doesn''t boot anymore after installation of VirtualBox guest
additions. Older builds before snv_129 were running fine too. I like some
features of this OS, but now I end with something funny.

I installed default snv_129, installed guest additions -> reboot, set
''noexec_user_stack=1 ; set noexec_user_stack-log=1'' in
/etc/system -> reboot and then :

pfexec zpool set dedup=verify rpool
pfexec zfs set compression=gzip-9 rpool
pfexec zfs set devices=off rpool/export/home
pfexec zfs set exec=off rpool/export/home
pfexec zfs set setuid=off rpool/export/home

after that reboot and I will end with error which you can see in attachment.
Boot with -s or -sv flags doesn''t help it''s in loop and all
the time it will end in this state without chance to get to login prompt either
CLI or GUI.

Is there a way to do something with it or is it fucked? :-) I want to know just
for my knowledge and knowledge of others thanks to archive in forum. No data or
similar stuff in this VM as it was only test.

Thanks a lot
-- 
This message posted from opensolaris.org
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Hi Tomas,

On 27/12/2009, at 7:25 PM, Tomas Bodzar wrote:
> pfexec zpool set dedup=verify rpool
> pfexec zfs set compression=gzip-9 rpool
> pfexec zfs set devices=off rpool/export/home
> pfexec zfs set exec=off rpool/export/home
> pfexec zfs set setuid=off rpool/export/home
grub doesn?t support gzip - so you will need to unset that and hope that it can
still boot with what has been written to disk.  It is possible you will need to
backup/reinstall.

I learnt this one the hard way - don?t use gzip compression on the root of your
rpool (you can on child filesystems that are not involved in the boot process
though)

HTH,
James

On Sun, Dec 27, 2009 at 11:25 AM, Tomas Bodzar <bodzart at openbsd.cz>
wrote:
> Hi all,
>
> I installed another OpenSolaris (snv_129) in VirtualBox 3.1.0 on Windows
because snv_130 doesn''t boot anymore after installation of VirtualBox
guest additions. Older builds before snv_129 were running fine too. I like some
features of this OS, but now I end with something funny.
>
> I installed default snv_129, installed guest additions -> reboot, set
''noexec_user_stack=1 ; set noexec_user_stack-log=1'' in
/etc/system -> reboot and then :
>
> pfexec zpool set dedup=verify rpool
> pfexec zfs set compression=gzip-9 rpool
> pfexec zfs set devices=off rpool/export/home
> pfexec zfs set exec=off rpool/export/home
> pfexec zfs set setuid=off rpool/export/home
>
> after that reboot and I will end with error which you can see in
attachment. Boot with -s or -sv flags doesn''t help it''s in
loop and all the time it will end in this state without chance to get to login
prompt either CLI or GUI.
>
> Is there a way to do something with it or is it fucked? :-) I want to know
just for my knowledge and knowledge of others thanks to archive in forum. No
data or similar stuff in this VM as it was only test.
>
gzip compression is not supported in GRUB zfs reader. You should avoid
using it for boot filesystem. If may try to revert compression setting
to "off or "on" (which defaults to lzjb) and try to boot that
way.
(That is if you didn''t rewrite any critical data after setting gzip
compression).


-- 
Regards,
        Cyril

Uh, but why system allowed that if it''s not running? And how to revert
it as I can''t boot even to single user mode? Is there a way to do that
with Live CD?
-- 
This message posted from opensolaris.org

you should be able to boot with the live cd then import the pool i would
think...


On Sun, Dec 27, 2009 at 4:40 AM, Tomas Bodzar <bodzart at openbsd.cz>
wrote:
> Uh, but why system allowed that if it''s not running? And how to
revert it
> as I can''t boot even to single user mode? Is there a way to do
that with
> Live CD?
> --
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
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So I booted from Live CD and then :

zpool import
pfexec zpool import -f rpool
pfexec zfs set compression=off rpool
pfexec zpool export rpool

and reboot but still same problem.
-- 
This message posted from opensolaris.org

You could revert to the @install snapshot (via the livecd) and swe if
that works for you.

-- Sriram

On 12/27/09, Tomas Bodzar <bodzart at openbsd.cz>
wrote:
> So I booted from Live CD and then :
>
> zpool import
> pfexec zpool import -f rpool
> pfexec zfs set compression=off rpool
> pfexec zpool export rpool
>
> and reboot but still same problem.
> --
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
-- 
Sent from my mobile device

On Sun, 27 Dec 2009, Cyril Plisko wrote:
>
> gzip compression is not supported in GRUB zfs reader. You should avoid
> using it for boot filesystem. If may try to revert compression setting
> to "off or "on" (which defaults to lzjb) and try to boot
that way.
> (That is if you didn''t rewrite any critical data after setting
gzip
> compression).
After changing the compression back to something which is supported, 
the boot archive could be manually re-generated:

   bootadm update-archive -R /a

where ''/a'' is a mount of the alternate root (the root on the
disk).

If any data is accessed which still uses gzip, then there will still 
be no joy.

Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/