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:
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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