[FUG-BR] Fw: Help test softupdates journaling (SUJ)

[Luiz Otavio O Souza]

Agora falta pouco ! (desculpem o cross posting, mas essa informação pode ser 
interessante para muita gente).

Sobre o reconhecimento do trabalho do desenvolvedor, procurem a mensagem do 
Maxim Sobolev na mesma thread =)

[]'s e bom fim de semana a todos.

-l



> Hello,
>
> I have been augmenting softupdates with a small journal that will be 
> processed in lieu of fsck in the event of a crash.  I have written some 
> about this project here: http://jeffr_tech.livejournal.com/
>
> For now I need volunteers who will attempt to crash the kernel code.  It 
> now passes fsx, fsstress, and stress2 on my box for many hours.  pho@ has 
> been helping me and may still have a bug or two but I need a wider 
> audience so we can be comfortable with the stability.  In a week or so I 
> will also provide the checker.  Until then a full fsck is required after a 
> crash.
>
> To install you will need to apply http://people.freebsd.org/~jeff/suj.diff 
> to a recent current source tree.  You will then need to recompile libufs, 
> fsck_ffs, and tunefs at a minimum.  You must disable softupdates on all 
> filesystems before rebooting with the SUJ kernel.  It is presently not 
> backwards compatible with softupdates without journaling but I will fix 
> that soon.
>
> You must disable background fsck by placing background_fsck="NO" in your 
> rc.conf.  You can enable suj by running tunefs -j enable /dev/{device}. 
> You can disable suj by running tunefs -j disable /dev/{device} and then 
> doing a full foreground fsck.  There are no ill effects from removing the 
> journal and you may go back to running a kernel without SUJ and using 
> softupdates without any incompatibilities.  I have not yet corrupted a 
> filesystem in testing.  tunefs allocates the journal which will be between 
> 2 and 64mb depending on the size of the filesystem.  I will probably 
> ultimately make the maximum smaller but presently the smaller of 1/1024th 
> of the fs or 64mb is used.
>
> I would suggest booting to single user to disable softupdates and enable 
> suj before rebooting with the suj enabled kernel.  Please also enable 
> crashdumps. You can see the freebsd handobok for instructions on that.  I 
> would also mention that there is a lot of expensive debugging code at 
> present.  You can expect some cpu slowdown but I also hope you will run 
> with INVARIANTS and WITNESS enabled to catch as many bugs as possible.
>
> I appreciate any and all assistance.  Even reports of everything going 
> smoothly after a few days uptime are valuable.
>
> Thanks,
> Jeff
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