Hi Everyone,
This is something that's come up in the past and has recently resurfaced
with a project I've been working on, and that is-- it seems to me as
though mmfsd never attempts to flush the cache of the block devices its
writing to (looking at blktrace output seems to confirm this). Is this
actually the case? I've looked at the gpl headers for linux and I don't
see any sign of blkdev_fsync, blkdev_issue_flush, WRITE_FLUSH, or
REQ_FLUSH. I'm sure there's other ways to trigger this behavior that
GPFS may very well be using that I've missed. That's why I'm asking :)
I figure with FPO being pushed as an HDFS replacement using commodity
drives this feature has *got* to be in the code somewhere.
-Aaron
--
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776
_______________________________________________
gpfsug-discuss mailing list
gpfsug-discuss at spectrumscale.org
http://gpfsug.org/mailman/listinfo/gpfsug-discuss
