On Jan 9, 2014, at 5:41 AM, Duncan <1i5t5.duncan@xxxxxxx> wrote: > Having checksumming is good, and a second > copy in case one fails the checksum is nice, but what if they BOTH do? > I'd love to have the choice of (at least) three-way-mirroring, as for me > that seems the best practical hassle/cost vs. risk balance I could get, > but it's not yet possible. =:^( I'm on the fence on n-way. HDDs get bigger at a faster rate than their performance improves, so rebuild times keep getting higher. For cases where the data is really important, backup-restore doesn't provide the necessary uptime, and minimum single drive performance is needed, it can make sense to want three copies. But what's the probability of both drives in a mirrored raid set dying, compared to something else in the storage stack dying? I think at 3 copies, you've got other risks that the 3rd copy doesn't manage, like a power supply, controller card, or logic board dying. Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
