Duncan posted on Mon, 04 Apr 2016 04:45:16 +0000 as excerpted: > Kai Krakow posted on Mon, 04 Apr 2016 02:00:43 +0200 as excerpted: > >> Does this also implement "copy-back" - thus, it returns the hot-spare >> device to global hot-spares when the failed device has been replaced? > > I don't believe it does that in this initial implementation, anyway. > > There's a number of issues with the initial implementation, including > the fact that the hot-spare is global only and can't be specifically > assigned to a filesystem or set of filesystems, which means, if you have > multiple filesystems using different sized devices, the hot-spares must > be sized to match the largest device they could replace,
Obviously the sizes issue is problematic for the hot-spare-return situation as well, since it would then be possible for an appropriately large replacement device to replace a much smaller device on some filesystem, which would then put the much smaller device into rotation as a hot-spare where it could end up picked to replace a far larger device. As there's currently no intelligence as to device sizes, etc, it just picks the next device in the hot-spares list and tries to use it, oops! So hot-spare-return really will need to wait until per-filesystem hot- spares and/or some sizing intelligence is added. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
