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Re: [Linux-cluster] Re: problems with 8 node production gfs cluster

David Teigland wrote:
On Mon, Apr 17, 2006 at 05:41:39PM +0200, Nemanja Miletic wrote:

Does anyone think that turning on journaling on files could help us
speed up the access to gfs partition?

This would be difficult because journaling can be turned on only on
files that are empty. We have a large number of empty files of active
users that download all their mail from pop3 server, so turning on
jurnaling for them should be possible.

Data journaling might help, it will speed up fsync(), but will increase
the i/o going to your storage.

What size should be the journals when file journaling is on?

Continue to use the default.

Another thing you might try is disabling the drop-locks callback, allowing
GFS to cache more locks.  Do this before you mount:
  echo "0" >> /proc/cluster/lock_dlm/drop_count

Did you apply this changes? Could you share the results of this changes in your configuration? Do you recommend it?
German Staltari

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