Lustre discuss - Mar 2009 - Setting atime_diff persistently across MDS remounts

Hi All,

Just to confirm... ?The following command will set
/proc/fs/lustre/mds/xxx/atime_diff persistently (to 86400s)?

tunefs.lustre --param mdt.atime_diff=86400 /dev/xxxx

At least with --dryrun, tunefs.lustre gives no feedback about whether
the parameter you are setting is a valid one. ?Hence the post to the
list!

Cheers,
Tim

On Mar 12, 2009  13:54 +0900, Tim Burgess wrote:
> Just to confirm... ?The following command will set
> /proc/fs/lustre/mds/xxx/atime_diff persistently (to 86400s)?
> 
> tunefs.lustre --param mdt.atime_diff=86400 /dev/xxxx
> 
> At least with --dryrun, tunefs.lustre gives no feedback about whether
> the parameter you are setting is a valid one. ?Hence the post to the
> list!
Note that using tunefs.lustre isn''t possible on a mounted filesystem.

Instead you can permanently change this while the system is mounted:

	lctl conf_param lustre-MDT0000.mdt.atime_diff=86400

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.