On Thu, Oct 13, 2016 at 1:54 PM, Mohr Jr, Richard Frank (Rick Mohr) <rm...@utk.edu> wrote: > >> 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.
does anyone have an actual figures on how much lower the performance is? like 10%, 20%, 30% the performance gap was probably mentioned somewhere else, but i missed it our next internal lustre build is going to use zfs for both mdt and ost, but the driver is a patchless kernel not so much performance. but if there's a tremendous performance gap, i'd like to be aware of that _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
