Take this for what it is: the opinion on someone who knows less about zfs than probably anyone else on this thread ,but...
I would like to add my support for this proposal. As I understand it, the reason for using ditto blocks on metadata, is that maintaining their integrity is vital for the health of the filesystem, even if the zpool isn't mirrored or redundant in any way ie laptops, or people who just don't or can't add another drive. One of the great things about zfs, is that it protects not just against mechanical failure, but against silent data corruption. Having this available to laptop owners seems to me to be important to making zfs even more attractive. Granted, if you are running a enterprise based fileserver, this probably isn't going to be your first choice for data protection. You will probably be using the other features of zfs like mirroring, raidz raidz2 etc. Am I correct in assuming that having say 2 copies of your "documents" filesystem means should silent data corruption occur, your data can be reconstructed. So that you can leave your os and base applications with 1 copy, but your important data can be protected. In a way, this reminds me of intel's "matrix raid" but much cooler (it doesn't rely on a specific motherboard for one thing). I would also agree that utilities like 'ls' and quotas should report both and count against peoples quotas. It just doesn't seem to hard to me to understand that because you have 2 copies, you halve the amount of available space. Just to reiterate, I think this would be an awesome feature! Celso. PS. Please feel free to correct me on any technical inaccuracies. I am trying to learn about zfs and Solaris 10 in general. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
