On Mon, Mar 18, 2013 at 12:32 PM, Jan Beranek <jan233...@gmail.com> wrote: > Hi all, > I'm preparing a strorage pool for large data with quite low importance > - there will be at least 3 hdd in "-d single" and "-m raid1" > configuration. > > mkfs.btrfs -d single -m raid1 /dev/sda /dev/sdb /dec/sdc > > What happen if one hdd fails? Do I lost everything from all three > discs or only data from one disc? (if from only one disc, then is it > acceptable otherwise not...)
I just finished doing some testing to check: It will work, kinda sorta. You'll be forced to mount read-only, and any reads of file extents that existed on the missing disk will return an io error. As I understand it, single doesn't force files to be on a single disk, instead it _doesn't_ force them to be _several_ disks; the implication being that a large file (say, a 4gb movie) may still end up with pieces on each disk. -- 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
