On 25/02/17 22:00, Phil Turmel wrote: >> This is all a rather important usage of raid, actually, imho. It >> > seems so obvious - create a temporary mirror, wait for the sync to >> > complete, suspend i/o to get the disk consistent, then you can break >> > the mirror and carry on. Terabytes :-) of data safely backed up in >> > the space of seconds. > No. Don't go there. There's already a technology out there that does > this correctly, called LVM snapshots. And they let you resume normal > operations after a very brief hesitation, and the snapshot holds the > static image while you copy it off. Will it let you put that snapshot on a hot-plug disk you can remove? For my little system I'd quite happily mirror it off onto a hard-disk and unplug it. Oh - and I'm not running lvm. Not that I think there's anything wrong with that, it's just yet another layer that I'm not (currently) comfortable with. Is there a sound technical reason not to go there, or is it simply a case of "learn another tool for that job"? The less tools I have to know the better, imho. (Although why I'm worrying, I don't know. I know btrfs is planning to make that obsolete :-) Cheers, Wol -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
