"...Tuning Gluster with VDO bellow is quite difficult and the overhead of using VDO could reduce performance ...." Yup. hense creation of a dedicated data00 volume from the 1TB SSD each server had. Matched options listed in oVirt.. but still OCP would not address the drive as target for deployment. That is when I opened ticket with RH and they noted Gluster is not a supported target for OCP. Hense then off to check if we could do CEPH HCI.. nope. "..I would try with VDO compression and dedup disabled.If your SSD has 512 byte physical..& logical size, you can skip VDO at all to check performance....." Yes.. VDO removed was/ is next test. But your note about 512 is yes.. Are their tuning parameters for Gluster with this? "...Also FS mount options are very important for XFS...." - What options do you use / recommend? Do you have a link to said tuning manual page where I could review and knowing the base HCI volume is VDO + XFS + Gluster. But second volume for OCP will be just XFS + Gluster I would assume this may change recommendations. Thanks,