Many thanks for clearing this up for me Andreas!!
Phil Dickens
On Thu, 5 Jul 2007, Andreas Dilger wrote:
On Jul 05, 2007 16:59 -0400, Phil Dickens wrote:
I am interested in disabling locking and client-side caching so that
the application itself can provide its own enforcement of file consistency
semantics and provide its own caching. I understand that Lustre is a
POSIX-compliant system; what I am unsure of is whether the locking and
caching system that provides such compliance can be disabled on a
per file basis.
In fact it can - use ioctl(fd, LL_IOC_SETFLAGS, LL_FILE_IGNORE_LOCK).
The file needs to be opened with O_DIRECT in order to do this. This
mode was added ages ago to test a similar usage but is never tested,
use at own risk (though reports of success/failure are still of interest).
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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