[Info-vax] Volume Shadowing internals

[El SysMan]

Great thanks for references  VMS OldBoys!

I have a small task to implement a cross-site replication of block devices. So, i simply made "full copy" of source device to target  - it's acceptable for NVMEoF in the LAN, but in case of "cross-site" we need to reduce a traffic.
I have supposed that Volume Shadowing may contains some kind of optimization to exclude copying unallocated LBN-s for example or may be maintain a bitmap for updated pages\buckets from last "synchronization" ...