Just for a practical scenario, here's the machine I have at my home. The front has four hot-swap drive bays, backed by a 3ware 4 port controller (IIRC a 9500 series). Two drives form a RAID1, which is where everything is kept. One drive is a hot spare. The fourth drive is a backup drive; my /home is on an xfs filesystem, so I use xfsdump to back that up, and store it on the fourth disk. Since it's hot swap, I can periodically remove the fourth drive and replace it with an empty disk; I can then store the old drive ''safely'' somewhere (if I were smart I would take it to work, but I haven't been smart yet). Now, to be fair, my storage needs are quite small: /home is only about 100GB (and is only 60% full). Obviously for storage at the multi- terabyte range you'll need more disks. --keith -- kkeller@xxxxxxxxxxxxx
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