How does replication works?

I was wondering if anyone can give me a preview of 'smart' how replication is between Equallogic San.

The reason I ask, I now have two without which replicate, and I noticed the following behaviors:

1. If a single file on a replicated volume changes day to day, replication that happens is by using a kind of differential technology, such that the entire volume is not replicated, just deltas.

2. If a single file on a volume is removed and then replaced with an updated version, no differential is used - all the content is re-copied in its entirety.

3. If a single file on a volume is deleted, but replaced by an identical copy of itself, still no premium is used - the entire file is re-copied.

Scenario 2 I can kind of understand, but the scenario 3 makes no sense to me.  There is no real change, the data are the same, but the entire file is copied during replication planning.

The Outlook or the articles I should read on?

Thank you!

its all on the blocks and not files. EQL use a huge blocks of 15 MB size is can be happened the to your data, is located a block away.  This is one of the reasons why the snaps need lots of space. If only a bit changed, a new page of 15 MB is allocated.

Kind regards

Joerg

Tags: Dell Products

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