2013/1/14 Mark Nelson <mark.nelson@xxxxxxxxxxx>: > The advice that I usually give people is that if performance is a big > concern, try to match filestore disk and journal performance is nearly > matched. In my test setup, I use 1 intel 520 SSD to host 3 journals for > 7200rpm enterprise SATA disks. A 1:4 ratio or even 1:6 ratio may also work > fine depending on various factors. So far the limits I've hit with very > minimal tuning seem to be around 15 spinning disks and 5 SSDs for around > 1.4GB/s (2.8GB/s including journal writes) to one node. Is this a ratio based on OSDs/SSDs or on OSDs/Server ? For example, a server with 12 spinning disks plus 2 internal SSD should be used for 12 OSDs. The first 6 will have journal on SSD1, the latest 6 will use SSD2. In this case, ratio is 1:6, right? Or are you referring to the whole server? -- 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
