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Last week we had a discussion at the office wether it would possible to span a RAID across USB sticks. That question came up as a joke while I was working on some RAID system for evaluation purposes. Well, my friend doubted it when I replied that it would definitely work out with a FreeBSD software RAID using gmirror (geom vinum as a matter of fact works, too). Proof? Here it is, a 'dmesg' from my Sony Vaio PCG-C1MGP bootet off two gmirrored 256 MB USB sticks: Copyright (c) 1992-2007 The FreeBSD Project. Of course it's not incredibly fast, but it works afterall, that was the whole point about it :-) Where could it be used? Possibly projects like FreeNAS, NAS4free (What's a NAS anway? Check out https://www.cloudwards.net/what-is-nas/), which support USB installs, could benefit from doing RAID1 on the sticks while also storing sensitive configuration data on them. I could also imagine to take backups this way, e.g. keep one working copy on the active stick on the computer, while swapping in spare sticks which then automatically rebuild the mirror. I suppose this also works with linux 'md' software raid, and netbsd's RAIDframe, though I've not tested it. What about Windows? Definitely not with stock functionality. However as there's also a way to patch in software RAID1 functionality into Windows 2000/XP Professional, one never knows ... ;-) |
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