Just my quick two cents here.
Technically this is possible which doesn't mean it's a good idea. I
wouldn't use such a setup in a productive environment. I don't think
they'll really save a lot and adding the latency etc on top not sure
this is what they're really looking for.
Just for testing and for giving it a try, sure but for the rest I would
go with a clear "no" instead of encouraging them to do that.
Maybe you can tell use more about their use-case? What are they looking
for, how large should this get, access protocols etc.
Kai
On 22.08.19 17:12, Brett Chancellor wrote:
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 <mailto: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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