On Jul 14, 2011, at 7:56 PM, Ken Mandelberg wrote:

> Under Legato the license restriction artificially keep the "file-device" 
> small relative to the tape storage. However, these days disks are 
> cheaper than tapes and license free we could afford a lot of disk space.

I know hard drives are cheap these days, but I didn't realise they were cheaper 
than tape nowadays.  LTO-4 media works out at less than 5 cents per GB 
(uncompressed) last time I bought it, and I believe LTO-5 is less than 4 cents 
per GB (again, uncompressed).

But, don't underestimate some of the perhaps-neglected advantages of tape:

- Easier to offsite for long-term archiving and disaster recovery
- WORM capability for regulatory compliance where needed
- Easier to expand total capacity---just buy more media
- Increasing capacity doesn't continually eat up rack space and drive up power 
consumption

Personally, I like the fact that Bacula supports a mixed disk/tape solution, 
allowing for disk to provide faster near-line access to more recent backups 
(e.g., incrementals) and tape for older material.

Cheers,

Paul.


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