Open Stack

Brebner, Gavin asked:

>Price ! Why provide expensive redundant storage when cheap disks will do just as well ?

Because you are interested in the total cost.

Using excessive network replication rather than local replication makes for a more expensive
And less robust solution -- as long as the local replication is of high enough quality.

Typical hardware RAID solutions are too stupid to be effective here. But replicas can be created
by file systems such as ZFS far more cost effectively than doing an extra network replica, and 
still be just as independent and provide just as much protection from data loss.

See http://etherpad.openstack.org/YMTqYzPmZQ