On 2011-07-15 07:28, Paul Mather 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).
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.
One more item to that list is data integrity. Most consumer HD's have
a BER 10^14, if you pay for 'enterprise' versions you may get to
10^15. Tape (LTO) is 10^17 and though not common generally here
T1000's are 10^19.
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