Hi On Sun, Aug 23, 2015 at 11:15 PM, Hannes Reinecke <hare@xxxxxxx> wrote: >> I looked at this commit and it actually adds SMR support to SCSI >> layer. Reverting ATA_DEV_ZAC means going back to zones-unaware >> algorithms. It is suboptimal but still much better than IO failures >> and "BTRFS: lost page write due to I/O error on /dev/sdc" errors I see >> at my computer. >> >> If this SMR support is considered as non-stable, can we at least get a >> kernel boot (or config) option that disables ZAC? >> > Again: Has anybody actually _tested_ that reverting this patch fixes > this issue? Yes I tested it. This error happens only under heavy load with a lot of read/writes (like btrfs rebalance). With current Linux-4.1.6 'btrfs balance' fails after ~10 minutes after start. I reverted ZAC related changes and then ran rebalancing. The operation finished successfully after 3 hours of running. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
