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.
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