I am looking to use Opensolaris/ZFS to create an iscsi SAN to provide storage for a collection of virtual systems and replicate to an offiste device.
While testing the environment I was surprised to see the size of the incremental snapshots, which I need to send/receive over a WAN connection, considering this is supposed to be block level replication. Having run several tests making minor changes to large files, I now see what is happening. When I use a text editor to modify a file, the whole file is written back to disk and so the snapshot includes every written block, whether that block contains the same information as before or not. Would it be possible to develop the incremental snapshot process so that they only contain changed written blocks rather than every written block. Certainly in my environment where we have large files (>500mb), the effect upon what is sent over the WAN would be drastically reduced. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
