On Mar 29, 2009, at 13:24, Bob Friesenhahn wrote:
With so few drives it does not make sense to use raidz2, and
particularly since raidz2 still does not protect against user error,
OS bugs, severe over-voltage from a common power supply, or
meteorite strike.
I remember reading on this list that for 3-5 drives, RAID-Z is
generally recommended, and for anything more that five drives RAID-Z2
would be the way to go. This had something to do with probability of
failures and space used for parity.
Don't remember the details, and I can't seem to find it in a search.
An external backup drive system that you can turn off (e.g. a USB or
eSATA drive) and detatch is the appropriately green solution. For
this pupose I use two large USB drives with ZFS in a mirrored
configuration.
There are also drive docks which make it easy to attach drives as well:
http://www.newertech.com/products/voyagerq.php
There are less expensive units that only have fewer connection options
(e.g., you only care about USB). This is good solution if you don't
care for the enclosure component, and simply want to leverage rotation
of inexpensive disks.
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