--- On Fri, 7/15/11, Steve Costaras <stev...@chaven.com> wrote:
From: Steve Costaras <stev...@chaven.com>
Subject: Re: [Bacula-users] Reliable Backups without Tapes?
To: "Paul Mather" <p...@gromit.dlib.vt.edu>
Cc: "Ken Mandelberg" <k...@mathcs.emory.edu>, bacula-users@lists.sourceforge.net
Date: Friday, July 15, 2011, 6:44 AM
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.
I've been using diskless backups since I started using bacula. Prior to
bacula, I was using amanda.
I use a SuperMicro chassis with 8 removable SATA drives. I use 1 for the
OS/bacula, so it stays in at all times. The other 7 are for a week of
backups. Every week, I run a script to unmount the SATA drives so I can remove
them and swap them with 7 other drives. I have 3 sets of 7.
Works quite well, and much cheaper than tape.
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