Hi, in fact it highly depend on your ceph underlying installation (both HW and Ceph version).
Would you be willing to share more information on your needs and design? How many IOPS are you looking at? Which processors and disks are you using? What ceph version? Which OS?
Are you targeting mostly read operations or write operations ? A mixin?
Honestly, serving three webservers (even distributing thousands of small assets) will perfectly fit on CephFS and the resulting performances would far better than GFS2 with less ops cost and a better health-management and data-protection.
Don’t forget that even block volumes are objects store,that’s your storage hardware, os configuration and ceph version that will drive your performances.
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