Hmm.. I guess that's what I've heard as well.

I do run compression and believe a lot of others would as well. So then, it 
seems
to me that if I have guests that run a filesystem formatted with 4k blocks for
example.. I'm inevitably going to have this overlap when using ZFS network
storage?

So if "A" were zfs blocks and "B" were virtualized guest blocks, I think it 
might
look like this with compression on?

|   B1   |   B2   |   B3   |   B4   |
|   A1   | A2 |     A3      |  A4  |

So if the guest OS wants blocks B2 or B4, it actually has to read 2 blocks from 
the
underlying zfs storage?
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