[Lustre-discuss] Enable async journals
Kevin Van Maren
kevin.van.maren at oracle.com
Tue Jul 13 06:17:09 PDT 2010
There were several bugs related to async journals in 1.8.1.1. Not sure
if all (known) async journal bugs were fixed in 1.8.3, but caveat emptor
-- there is probably a reason it is not enabled by default.
set_param is non-persistent, so would need to be re-done after every mount.
The tunefs command you have there _removes_ the journal, which is NOT
what you want -- I think you JUST run the set_param line.
After setting (to 0), you can verify with "lctl get_param
obdfilter.*.sync_journal"
See the email thread between Kit and Andreas -- there should be a
bugzilla for not being able to change the default, as in:
lctl conf_param {fsname}.obdfilter.sync_journal=0
Kevin
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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