El 06/05/14 17:57, Sergey Malinin escribi?: > 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. thanks for your resonse. This is true, a single SSD failure also mean 3 OSD failure (50% loss capacity of each node and 16% of total capacity ), but the journal SSDs are intel SC3700 and them should be very reliable. >> 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 3SC3700 >> 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
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