You could move your Journal to another SSD this would remove the double write. Ideally you’d want one or two PCIe NVME in the servers for the Journal.
Or if you can hold off a bit then bluestore, which removes the double write, however is still handy to move some of the services to a seperate disk. ,Ashley Sent from my iPhone On 23 Jun 2017, at 7:45 PM, Massimiliano Cuttini <m...@phoenixweb.it<mailto:m...@phoenixweb.it>> wrote: Of course yes! SSD bottleneck is the SATA controller. If you use a NVMe/PCIe controller you get from almost the same SSD 2.400MB/sec instead of 580MB/sec. 2400MB/sec x 8 = ~19Gbit/sec 580MB/sec x 8 = ~5 Gbit/sec If you don't trust me take a look at this benchmark between 2 really common SSD in the consumer market: http://ssd.userbenchmark.com/Compare/Samsung-960-Pro-NVMe-PCIe-M2-512GB-vs-Samsung-850-Pro-256GB/m182182vs2385 So of course, talking about SSD, your speed is grossy the SATA controller (minus the overhead of the protocol). Il 22/06/2017 20:35, c...@jack.fr.eu.org<mailto:c...@jack.fr.eu.org> ha scritto: On 22/06/2017 19:19, Massimiliano Cuttini wrote: We are already expecting the following bottlenecks: * [ SATA speed x n° disks ] = 24Gbit/s * [ Networks speed x n° bonded cards ] = 200Gbit/s 6Gbps SATA does not mean you can read 6Gbps from that device _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
