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" <pshem.k@xxxxxxxxx> 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 regardsPshem
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