Good day, Some controllers do not allow to set a 4k block on a boot device. With some installations of Ovirt in the configuration of ssd for boot OS and hdd (4k) for data domain, engine is installed on ssd with a block size of 512e and then transferred to hdd 4k. and if I wanted to leave the engine on ssd (in a separate partition which will also have a size of 512e), I encountered an incompatibility error between block sizes 512 and 4k (example glusterfs or when the data domain was configured as posix compliant fs). NFS domain passed. As I understand it, the NFS uses 512e as well as the drivers of the guest machines, and a VM created on a domain with a 4k block will still have 512e. As a result, we have a block of size 512 in any case. Does it make sense to use devices with a 4k block at the present time? Is there any configuration to take advantage of 4K? Thanks in advance. Best regards.