In a past life I had a bunch of SAN gear dumped in my lap, it was spec’d by someone else misintepreting vague specs. It was SAN gear with an AoE driver. I wasn’t using Ceph, but sending it back and getting a proper solution wasn’t an option. Ended up using SAN gear as a NAS with a single client, effectively DAS. It was a nightmare: cabling, monitoring, maintenance. This could be done, but as Kai says latency would be an issue. One would also need to pay *very* close attention to mappings and failure domains, there is considerable opportunity here to shoot oneself in the foot when a component has issues. > 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@xxxxxxxxxxx> 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 >> >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx >> >> >> _______________________________________________ >> ceph-users mailing list -- >> ceph-users@xxxxxxx >> >> To unsubscribe send an email to >> ceph-users-leave@xxxxxxx > -- > SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, D 90409 Nürnberg > GF:Geschäftsführer: Felix Imendörffer, (HRB 247165, AG München) > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |