I would probably go with less size osd disks, 4TB is to much to loss in case of a broken disk, so maybe more osd daemons with less size, maybe 1TB or 2TB size. 4:1 relationship is good enough, also i think that 200G disk for the journals would be ok, so you can save some money there, the osd's of course configured them as a JBOD, don't use any RAID under it, and use two different networks for public and cluster net.
*German* 2015-07-01 18:49 GMT-03:00 Nate Curry <cu...@mosaicatm.com>: > I would like to get some clarification on the size of the journal disks > that I should get for my new Ceph cluster I am planning. I read about the > journal settings on > http://ceph.com/docs/master/rados/configuration/osd-config-ref/#journal-settings > but that didn't really clarify it for me that or I just didn't get it. I > found in the Learning Ceph Packt book it states that you should have one > disk for journalling for every 4 OSDs. Using that as a reference I was > planning on getting multiple systems with 8 x 6TB inline SAS drives for > OSDs with two SSDs for journalling per host as well as 2 hot spares for the > 6TB drives and 2 drives for the OS. I was thinking of 400GB SSD drives but > am wondering if that is too much. Any informed opinions would be > appreciated. > > Thanks, > > *Nate Curry* > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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