It's certainly possible. It makes things a little more complex though. Some questions you may want to consider during the design.. - Is the customer aware this won't preserve any data on the luns they are hoping to reuse. - Is the plan to eventually replace the SAN with JBOD, in the same systems? If so you may want to make your luns look like the eventual drive size and count. - Is the plan to use a few systems with SAN and add standalone systems later? Then you need to calculate expected speeds and divide between failure domains. - Is the plan to use a couple of hosts with SAN to save money, and have the rest be traditional Ceph storage? If so consider putting the SAN hosts all in one failure domain. - Depending on the SAN you may consider aligning your failure domains to different arrays, switches, or even array directors. - Remember to take the hosts network speed into consideration when calculating how many luns to put on each host. Hope that helps. -Brett On Thu, Aug 22, 2019, 4:14 AM Mohsen Mottaghi <mohsenmottaghi(a)outlook.com> wrote: