El 06/05/14 18:17, Christian Balzer escribi?: > On Tue, 6 May 2014 18:57:04 +0300 Sergey Malinin wrote: > >> My vision of a well built node is when number of journal disks is equal >> to number of data disks. You definitely don't want to lose 3 journals at >> once in case of single drive failure. >> > While that certainly is true not everybody is having unlimited budgets. > > I'd expect the DC3700 to outlast the spinning rust, especially if the > implementor is SMART enough to be replace things before something > unforetold were to happen. > > However using a 100GB DC3700 with those drives isn't particular wise > performance wise. I'd at least use the 200GB ones. Hi Christian, you are right, I should use the 200GB ones at least. Thanks! > > Regards, > > Christian >>> 06 ??? 2014 ?., ? 18:07, Xabier Elkano <xelkano at hostinet.com> >>> ???????(?): >>> >>> >>> Hi, >>> >>> I'm designing a new ceph pool with new hardware and I would like to >>> receive some suggestion. >>> I want to use a replica count of 3 in the pool and the idea is to buy 3 >>> new servers with a 10-drive 2,5" chassis each and 2 10Gbps nics. I have >>> in mind two configurations: >>> >>> 1- With journal in SSDs >>> >>> OS: 2xSSD intel SC3500 100G Raid 1 >>> Journal: 2xSSD intel SC3700 100G, 3 journal for each SSD >>> OSD: 6 SAS10K 900G (SAS2 6Gbps), each running an OSD process. Total >>> size for OSDs: 5,4TB >>> >>> 2- With journal in a partition in the spinners. >>> >>> OS: 2xSSD intel SC3500 100G Raid 1 >>> OSD+journal: 8 SAS15K 600G (SAS3 12Gbps), each runing an OSD process >>> and its journal. Total size for OSDs: 3,6TB >>> >>> The budget in both configuration is similar, but the total capacity >>> not. What would be the best configuration from the point of view of >>> performance? In the second configuration I know the controller write >>> back cache could be very critical, the servers has a LSI 3108 >>> controller with 2GB Cache. I have to plan this storage as a KVM image >>> backend and the goal is the performance over the capacity. >>> >>> On the other hand, with these new hardware, what would be the best >>> choice: create a new pool in an existing cluster or create a complete >>> new cluster? Are there any advantages in creating and maintaining an >>> isolated new cluster? >>> >>> thanks in advance, >>> Xabier >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users at lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> _______________________________________________ >> ceph-users mailing list >> ceph-users at lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
 |