On Wed, Sep 17, 2003 at 08:56:02AM -0600, Rodolfo J. Paiz wrote:
> I recently set up a NAS box for a customer, using a Promise chassis
> and 15 250GB drives, which resulted in 3.25TB real useful space and
> cost a total of $6,000 (overall cost per GB: $1.85).
You make a good argument that disks are cheap and fast and that raid
is reliable against individual disk failures. But in your details you
miss at least two key reasons for making "backups":
1. They can be kept off-site and so protect against a generalized
site failure (earthquake, hurricane, fire, flood, roof collapse
under heavy snow, etc.)
2. Time travel (I want to see an old version of a file) and recovery
from mistakes ("sudo rm -rf /").
Heaps of disks in raid setups can be part of dealing with both of
these worries, but a single 15 disk array doesn't do the trick.
Add things like rsnapshot and maybe a more disks at a second location,
and it is possible to get good backups from disks, but describing a
single array does not answer someone asking about backups.
-kb, the Kent who thinks tape *is* outdated for most (all?) backup
scenarios, but the Kent who also tries to be hard-headed about how to
wisely deploy it.
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