On Wed, March 17, 2010 10:19, Edward Ned Harvey wrote: > However, removable disks are not very > reliable compared to tapes, and the disks are higher cost per GB, and > require more volume in the safe deposit box, so the external disk usage is > limited... Only going back for 2-4 weeks of archive...
Last 5 times I checked, tapes were vastly more expensive than disks, even if you ignored the drive cost. Let's see...currently buy.com lists an lt30 cartridge at about $25, for 400GB; a 2TB drive is about $170. So yeah, they're a little cheaper than disk now (IF you ignore the drive cost; the cheap ones seem to be around $1800). I had a very satisfactory QIC-60 tape streamer in the 1980s, and a couple of rather unsatisfactory DAT drives later. I've been backing up to disk since then, seems to be a lot easier, quicker, cheaper, and more stable, on my scale. When you go to much bigger setups, the trade-offs change; the value of the space in the safe starts to show up as significant, the drive cost becomes less of an issue, and so forth. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
