[Lustre-discuss] Enable async journals

[Shuichi Ihara]

Frank,

> tune2fs -O ^has_journal<ost-device>  on all OSSes for all all OSTs

What is a reason of removing the journal feature? You should have the journal even whether you want to enable
async_journal or not.
Also, as far as I could see, in general, without enabling async journal, we could see better performance on using
external journals rather than the internal journal.
However, once async_journal is enabled, we could see same (in some case, better) performance even the
internal journal is used.

Thanks
Ihara

(7/13/10 9:53 PM), Frank Heckes wrote:
> Hi all,
>
> we use SLES 11 and Lustre 1.8.1.1 + patches and like convert a lustre FS
> using external journals to one with async journals enabled.
> Question is whether the procedure:
>
> umount<filesystem>              on all clients
> umount<osts>                    on all OSSes
> e2fsck<ost-device>              on all OSSes for all all OSTs
> tune2fs -O ^has_journal<ost-device>  on all OSSes for all all OSTs
> lctl set_param obdfilter.*.sync_journal=0  on all OSSes
> mount<osts>                     on all OSSes
> mount<filesystem>               on all clients
>
> is correct to do the job? (I hope it isn't neccessary to recreate a FS
> from scratch.) Many thanks in advance.
>
> Cheers
>
> -Frank Heckes
>
> P.S.: 1.8.1.1 still contains some bugs which have been fixed in 1.8.3.
> Described setup is for test purpose only, but the procedure shall be
> used in the final environment (using lustre 1.8.3), too.
>
>
>
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