On Fri, Jul 15, 2011 at 8:28 AM, Paul Mather <paul AT gromit.dlib.vt DOT edu> 
wrote:
> 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).
>
Large SATA Disks are cheaper for small setups where the cost of the
tape drive / archive dominates. However if you consider power
requirements of disks and that you should not backup to a single raid
array but instead make 2 backup copies to different raid arrays (or
sets of disks) on different machines possibly with one set offsite the
disk price advantage diminishes for setups less than 20TB or so.
>
> 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.

Agreed

John

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