You would need to modify the crush map, so that it would store two of the same replica's on the same host, however I'm not sure how you would go about this and still make sure that at least 1 other replica is on a different host. But to be honest with the amount of OSD's you will have, the data loss probability with a replica size of 2 is not as bad as when you have much larger clusters so you may decide that size 2 is fine. But as always, make sure you have backups. -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Lindsay Mathieson Sent: 29 December 2014 22:24 To: Nick Fisk Cc: ceph-users@xxxxxxxx Subject: Re: Improving Performance with more OSD's? On Sun, 28 Dec 2014 04:08:03 PM Nick Fisk wrote: > If you can't add another full host, your best bet would be to add > another > 2-3 disks to each server. This should give you a bit more performance. > It's much better to have lots of small disks rather than large > multi-TB ones from a performance perspective. So maybe look to see if > you can get 500GB/1TB drives cheap. Thanks, will do. Can you set replica 3 with two nodes and 6-8 OSD's? one would have to tweak the crush map? -- Lindsay _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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