> On Oct 13, 2016, at 12:32 PM, E.S. Rosenberg <esr+lus...@mail.hebrew.edu> 
> wrote:
> I thought ZFS was only recommended for OSTs and not for MDTs/MGS?

ZFS usually has lower metadata performance for MDT than using ldiskfs which is 
why some people recommend ZFS only for the OSTs.  However, ZFS has features 
(like snapshots) that are useful for the MDT so some folks are willing to 
accept a performance hit in order to take advantage of those features.

Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences

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