On 2022-11-08 at 09:36, Nicolas George wrote: > Curt (12022-11-08): > >> Redundancy sounds a lot like a back up. > > RAID also sounds a lot like a backup, and the R means redundant. > > Yet raid is not a backup. That depends on which sense of the word "backup" you are using. No, it's not a "backup" in the technical "back it up to tape" sense of the word. There are many types of data-loss scenarios in which it will not protect you at all. But it does mean that if one drive fails, you can still fall back to the copy on the other drive, and thus that copy is serving as a backup to the copy on the first drive. There are some data-loss scenarios in which RAID will protect you. That more general sense of "backup" as in "something that you can fall back on" is no less legitimate than the technical sense given above, and it always rubs me the wrong way to see the unconditional "RAID is not a backup" trotted out blindly as if that technical sense were the only one that could possibly be considered applicable, and without any acknowledgment of the limited sense of "backup" which is being used in that statement. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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