On Wed, 20 Jan 2010, Ian Collins wrote:
Commercial backup solutions are available for ZFS.
I know tape backup isn't sexy, but it's a reality for many of us and it's
not going away anytime soon.
True, but I wonder how viable its future is. One of my clients requires 17
LT04 types for a full backup, which cost more and takes up more space than
the equivalent in removable hard drives.
In the past few years growth in hard drive capacities has outstripped tapes
to the extent that removable hard drives and ZFS snapshots have become a more
cost effective and convenient backup media.
In all of these discussions, people seem to forget some very important
criteria. That important criteria is the time required for a full
recovery from backup.
If the company is not able to survive more than a week with total
disruption of business, but the full restore will take three weeks,
then the backup has been rendered 100% ineffective.
When planning for recovery from disaster, the time to recover is
exceedingly important.
When using the backup to filesystem approach, that backup could be
done to a remote mirrored system (filesystems + hardware) which is
sufficiently distant to protect against any local disaster. If there
is a disaster in the local data center, that system could be
immediately put on line (assuming adequate connectivity), or that
system could be loaded on a truck for overnight delivery as a
replacement to the data center.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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