Hi, I am running on 3 MDS servers (1 active and 2 backups and I recommend that) each of 128 GB of RAM (the clients are running ML analysis) and I have about 20 mil inodes loaded in ram. It's working fine except some warnings I have "client X is failing to respond to cache pressure." Besides that there are no complaints but I thing you would need the 256GB of ram specially if the datasets will increase... just my 2 cents.. Will you have SSD ? On Fri, Feb 7, 2020 at 12:02 AM Matt Larson <larsonmattr@xxxxxxxxx> wrote: > Hi, we are planning out a Ceph storage cluster and were choosing > between 64GB, 128GB, or even 256GB on metadata servers. We are > considering having 2 metadata servers overall. > > Does going to high levels of RAM possibly yield any performance > benefits? Is there a size beyond which there are just diminishing > returns vs cost? > > The expected use case would be for a cluster where there might be > 10-20 concurrent users working on individual datasets of 5TB in size. > I expect there would be lots of reads of the 5TB datasets matched with > the creation of hundreds to thousands of smaller files during > processing of the images. > > Thanks! > -Matt > > -- > Matt Larson, PhD > Madison, WI 53705 U.S.A. > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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