Hello, On Fri, 4 Sep 2015 12:30:12 -0300 German Anders wrote:
> Hi cephers, > > I've the following scheme: > > 7x OSD servers with: > Is this a new cluster, total initial deployment? What else are these nodes made of, CPU/RAM/network? While uniform nodes have some appeal (interchangeability, one node down does impact the cluster uniformly) they tend to be compromise solutions. I personally would go with optimized HDD and SSD nodes. > 4x 800GB SSD Intel DC S3510 (OSD-SSD) Only 0.3DWPD, 450TB total in 5 years. If you can correctly predict your write volume and it is below that per SSD, fine. I'd use 3610s, with internal journals. > 3x 120GB SSD Intel DC S3500 (Journals) In this case even more so the S3500 is a bad choice. 3x 135MB/s is nowhere near your likely network speed of 10Gb/s. You will vastly superior performance and endurance with two 200GB S3610 (2x 230MB/s) or S3700 (2x365 MB/s) Why the uneven number of journals SSDs? You want uniform utilization, wear. 2 journal SSDs for 6 HDDs would be a good ratio. > 5x 3TB SAS disks (OSD-SAS) > See above, even numbers make a lot more sense. > > The OSD servers are located on two separate Racks with two power circuits > each. > > I would like to know what is the best way to implement this.. use the > 4x 800GB SSD like a SSD-pool, or used them us a Cache pool? or any other > suggestion? Also any advice for the crush design? > Nick touched on that already, for right now SSD pools would be definitely better. Christian -- Christian Balzer Network/Systems Engineer [email protected] Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
