🚀 go-pugleaf

In article <1992Sep4.131659.122@inet.d48.lilly.com>, rz63633@stewball.d50.lilly.com (Gregg A. Mantock) writes:
> Does anyone know if a file can span accross multiple devices
> in a clustered file system?  Say that a file is created on a
> particular device in a clustered file system.  As the file
> continues to grow it fills the device that it was created on.
> Will the remainder of the file be written to one of the other
> devices in the cluster, or will the process writing to the 
> file abend?
> 
> This becomes an interesting situation when the Data Migration
> Facility and File System Monitoring are running on the
> clustered file system.  Fsmon shows %used based on the whole
> cluster of devices, but df shows the %free on each device.
> Can I assume that fsmon knows what it is doing and that the
> clustered file system need not be migrated until the entire
> cluster hits the warning/critical threshold?
> 
> Thanks,
> Gregg
> -- 

Yes, the clustered file system need not be migrated until the entire
cluster's warning/critical thresholds are reached.  DMF manages a clustered
file system as it would a normal (i.e. contained on one device) filesystem.
Therefore, you want DMF actions started by fsmon, since it also views
the cluster as a single filesystem. 

Hope this helps,
Jim
-- 
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Jim Gmeinder		Cray Research, Inc.		(612)-683-5581