its all about blocks and not about files. EQL use a huge block size of 15MB so it might be happened the at your data is within a block.  this is one of the reasons why snaps need a lot of space. if only one bit have changed a new 15MB page is allocated. Regards, Joerg
Just wondering if someone can give me a rundown of how 'smart' replication is between Equallogic SANs. The reason I ask, I now have two SANs that are replicating, and I've noticed the following behaviour: 1. If a single file on a replicated volume changes day-to-day, the replication that happens is using some kind of differential technology, such that the entire volume isn't replicated, merely the deltas. 2. If a single file on a volume is deleted then replaced with an updated version, no differential is used - the entire contents are re-copied in its entirety. 3. If a single file on a volume is deleted, but then replaced with an identical copy of itself, still no differential is used - the entire file is re-copied.  Scenario 2 I can kind of understand, but scenario 3 makes no sense to me.  There is no real change, the data is the same, yet the entire file is re-copied during the replication schedule.  Any insight or articles I should read up on? Thanks!
How does replication work?