grr. Gmail is terrible :-/ I understood that a btrfs RAID1 would at best grab one block from sdb and then one block from sdd in round-robin fashion, or at worse grab one chunk from sdb and then one chunk from sdd. Alternatively I thought that it might read from both simultaneously, to make sure that all data matches, while at the same time providing single-disk performance. None of these was the case. Running a single IO-intensive process reads from a single drive. Did I misunderstand the documentation and is this normal, or is this a bug? Nicholas On 9 March 2016 at 15:21, Nicholas D Steeves <nsteeves@xxxxxxxxx> wrote: > Hello everyone, > > I've run into an expected behaviour for a my two disk RAID1. I mount > with UUIDs, because sometimes my USB disk gets /dev/sdc instead of > /dev/sdd. The two elements of my RAID1 are currently sdb and sdd. > > dstat -tdD total,sdb,sdc,sdd > > It seems that per process, reads come from either sdb or sdd. This > surprises me, because I understood that a btrfs RAID1 -- 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
