howto: enabling journaling on softupdates

[Niclas Zeising]

On 2011-08-31 20:02, Hartmann, O. wrote:
> On 08/31/11 19:56, Garrett Cooper wrote:
>> On Wed, Aug 31, 2011 at 10:34 AM, Hartmann, O.
>> <ohartman at zedat.fu-berlin.de>  wrote:
>>>    I try to find a suitable reading/howto for how to enable softupdates
>>>    on
>>>    UFS2 filesystems.
>> Agreed. Added to http://wiki.freebsd.org/DocsFor9x .
> Many thanks.
> 
>>> As I could see, SU+J is enlisted to be enabled by default in
>>> 9.0-RELEASE.
>> Yes, it is on by default in bsdinstall (and I think in newfs? I could
>> be wrong).
> Great!
> 
>>>    What is the status quo of that? I've several active systems running
>>>    UFS2 on their system disks while data/home/mass storage is ZFS.
>>>    Are their any issue with SU+J?
>> I haven't been tracking what's been going on, but several bugfixes
>> have gone in in the last couple of months post-SUJ. There might be
>> some bugs in the work, but most standard operations work out of the
>> box for me at least.
>>
>> ...
>>
>>>    I hit was "-J", the option for enabling softupdate via GEOM gjournal.
>> Yeah, it's confusing..
>>
>>>    Is there any special preparation to bring up an existing filesystem
>>>    securely into
>>>    journaling? As I read the blogs and emails in the list, it should be
>>>    as simple
>>>    as booting into single user mode, enabling on all partitions in
>>>    question (even / ?)
>> Yes.
>>
>>>    via -j softupdate-journaling, runing a foreground fsck, reboot ...
>>>    that's it?
>> If all goes well, that was the entire process IIRC.
> 
> To late ... ;-) I couldn't resist the temptation, shut down the box,
> reboot single user mode,
> enabled "-j" (the lower letter `j' !!!), did a full fsck -y ... rebooted
> ...
>>>    Or is there any other additional preparation like mentioned in
>>> gjournal
>>>    (async mount)?
>> ENOCLUE (because I'm not aware of that with gjournal -- the last time
>> I tried setting it up things didn't work too well for me) :).
>>
>>>    Thanks for patience and repsonding,
>> Sure :)!
>> -Garrett
>> _____________
> 
> ... and here I am again with SU+J on my box ;-)
> 
> Tomorrow, I will perform this step on all servers. I guess it's a "worth
> having".
> 
> 
> Oliver

Can you please detail a little more the steps you took to enable SU+J
and your experience with it? It sounds like a good start for a howto or
an inclusion in the handbook.
Thanks!

-- 
Niclas Zeising