The underlying device in this context is the NSD, network storage device. This has relation at all to 512 byte or 4K disk blocks. Usually around a meg, always a power of two.
-- ddj Dave Johnson > On Mar 21, 2019, at 9:22 AM, Dorigo Alvise (PSI) <alvise.dor...@psi.ch> wrote: > > Hi, > I'm a little bit puzzled about different meanings of blocksize for different > GPFS installation (standard and gnr). > > From this page > https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning > > I read: > The blocksize is the largest size IO that GPFS can issue to the underlying > device > A subblock is 1/32nd of blocksize. This is the smallest allocation to a > single file > For non-gnr GPFS device is quite clear to me (I hope): it is a single > spinning disk (or ssd). And I verified this on a small cluster composed of > nsd using their local hard drive. > > Can someone explain what is the "device" in the case of GNR ? a single pdisk ? > > Thanks, > > Alvise > > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss
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