> Hi all, > I need to move a filesystem off of one host and onto another > smaller > one. The fs in question, with no compression enabled, is using 1.2 TB > (refer). I'm hoping that zfs compression will dramatically reduce this > requirement and allow me to keep the dataset on an 800 GB store. Does > this sound feasible? Can I achieve the move to the new box using zfs > send/receive? If so, how do I do it? Do I turn on compression on the > target host just after I begin the zfs send/receive?
How much your data compresses, is dependent on what type of data you have. JPG files won't compress at all, neither will any other already-compressed file format. But if you have a gene sequence file, it'll compress 10:1 because it's so repetitive internally. For typical filesystems, about 70% of original size is a good estimate. Now: If your data will fit into the 800gb drive, it will be tight. And you SHOULD NOT do that. For one, performance of that drive will be horrible, at best. And I've heard a trend of horror stories, that zfs has a tendency to implode when it's very full. So try to keep your disks below 90%. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
