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@outlook.com> wrote:

Hi

Yesterday one of our customers asked us a strange request. He asked us to use SAN as the Ceph storage space to add the SAN storages it currently has to the cluster and reduce other disk purchase costs.

Anybody know can we do this or not?! And if this is possible how we should start to architect this Strange Ceph?! Is it good or not?!

Thanks for your help.

Mohsen Mottaghi

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