2013/1/16 Mark Nelson <mark.nelson@xxxxxxxxxxx>: > Looks like a fun configuration to test! Having said that, I have no idea > how stable flashcache is. It's certainly not something we've used in > production before! Keep that in mind. As wrote before, this should not be an issue, ceph should handle failures. But is ceph able to detect a badly-wrote blocks? > With only 2 SSDs for 12 spinning disks, you'll need to make sure the SSDs > are really fast. I use Intel 520s for testing which are great, but I > wouldn't use them in production. The S3700 might be a good bet at larger > sizes, but it looks like the 100GB version is a lot slower than the 200GB > version, and that's still a bit slower than the 400GB version. Assuming you > have 10GbE, you'll probably be capped by the SSDs for large block sequential > workloads. Having said that, I still think this has potential to be a nice > setup. Just be aware that we usually don't stick that much stuff on the > SSDs! 12 spinning disks will be the worse scenario. When in production i'll start with 5 server, with 6 disks each (3+3 for each SSD) Then i'll try to add hosts instead of adding disks. I don't have 10GbE actually but only 2GbE bonded. I can evaluate 4GbE. > It'd be amazing if supermicro could cram another 2 SSD slots in the back. > Maybe by that time we'll all be using PCIE flash storage though. :) How much a PCIE storage? -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
