Hi, I think the ratio is based on SSD max throughput/HDD max throughput For example: one 400 Mbps SSD could be journal for 4 100 Mbps SAS.
This is my idea, I'm also building a Ceph Storage for Openstack. Could you guys give some experiences? On Dec 23, 2015 03:04, "Pshem Kowalczyk" <pshe...@gmail.com> wrote: > Hi, > > We'll be building our first production-grade ceph cluster to back an > openstack setup (a few hundreds of VMs). Initially we'll need only about > 20-30TB of storage, but that's likely to grow. I'm unsure about required > IOPs (there are multiple, very different classes of workloads to consider). > Currently we use a mixture of on-blade disks and commercial storage > solutions (NetApp and EMC). > > We're a Cisco UCS shop for compute and I would like to know if anyone here > has experience with the C3160 storage server Cisco offers. Any particular > pitfalls to avoid? > > I would like to use SSD for journals, but I'm not sure what's the > performance (and durability) of the UCS-C3X60-12G0400 really is. > What's considered a reasonable ratio of HDD to journal SSD? 5:1, 4:1? > > kind regards > Pshem > > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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