Re: [lustre-discuss] Lustre [2.8.0] flock Functionality

[Mohr Jr, Richard Frank (Rick Mohr)]

> On Mar 28, 2017, at 1:49 PM, DeWitt, Chad  wrote:
> 
> We've encountered several programs that require flock, so we are now 
> investigating enabling flock functionality.  However, the Lustre manual 
> includes a passage in regards to flocks which gives us pause:
> 
> "Warning
> This mode affects the performance of the file being flocked and may affect 
> stability, depending on the Lustre version used.  Consider using a newer 
> Lustre version which is more stable. If the consistent mode is enabled and no 
> applications are using flock, then it has no effect."
> 
> We are running Lustre 2.8.0 (servers and clients).  I've looked through Jira, 
> but didn't see anything that looked like a showstopper.  
> 
> Just curious if anyone has enabled flocks and encountered issues?  Anything 
> in particular to look out for?

I have enabled flock on all my Lustre file systems (2.4.3 and 2.8), and I have 
not yet encountered any issues.

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

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[lustre-discuss] Lustre [2.8.0] flock Functionality

[DeWitt, Chad]

Good afternoon, All.

We've encountered several programs that require flock, so we are now
investigating enabling flock functionality.  However, the Lustre manual
includes a passage in regards to flocks which gives us pause:

"Warning
This mode affects the performance of the file being flocked and may affect
stability, depending on the Lustre version used.  Consider using a newer
Lustre version which is more stable. If the consistent mode is enabled and
no applications are using flock, then it has no effect."

We are running Lustre 2.8.0 (servers and clients).  I've looked through
Jira, but didn't see anything that looked like a showstopper.

Just curious if anyone has enabled flocks and encountered issues?  Anything
in particular to look out for?

Thank you in advance,
Chad



Chad DeWitt, CISSP | HPC Storage Administrator

UNC Charlotte *| *ITS – University Research Computing


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