[gpfsug-discuss] Fileheat

[Jan-Frode Myklebust]

What about filesystem atime updates. We recently changed the default to
«relatime». Could that maybe influence heat tracking?



  -jf


tir. 13. aug. 2019 kl. 11:29 skrev Ulrich Sibiller <
u.sibiller at science-computing.de>:

> On 12.08.19 15:38, Marc A Kaplan wrote:
> > My Admin guide says:
> >
> > The loss percentage and period are set via the configuration
> > variables *fileHeatLossPercent *and *fileHeatPeriodMinutes*. By default,
> the file access temperature
> > is not
> > tracked. To use access temperature in policy, the tracking must first be
> enabled. To do this, set
> > the two
> > configuration variables as follows:*
>
> Yes, I am aware of that.
>
> > fileHeatLossPercent*
> > The percentage (between 0 and 100) of file access temperature dissipated
> over the*
> > fileHeatPeriodMinutes *time. The default value is 10.
> > Chapter 25. Information lifecycle management for IBM Spectrum Scale
> *361**
> > fileHeatPeriodMinutes*
> > The number of minutes defined for the recalculation of file access
> temperature. To turn on
> > tracking, *fileHeatPeriodMinutes *must be set to a nonzero value. The
> default value is 0
> >
> >
> > SO Try setting both!
>
> Well, I have not because the documentation explicitly mentions a default.
> What's the point of a
> default if I have to explicitly configure it?
>
> > ALSO to take effect you may have to mmshutdown and mmstartup, at least
> on the (client gpfs) nodes
> > that are accessing the files of interest.
>
> I have now configured both parameters and restarted GPFS. Ran a tar over a
> directory - still no
> change. I will wait for 720minutes and retry (tomorrow).
>
> Thanks
>
> Uli
>
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