I've got a system running the Debian kernel package of 3.14.1. It uses BTRFS for root and for a backup device. It seems that the backup device (a 2TB SATA disk in a USB enclosure) is failing and I'm getting a lot of messages saying "BTRFS: read error corrected". I guess that it's all metadata that's affected by the read errors - which isn't surprising as an rsync backup without the -c option doesn't read much file data. So far dmesg reports that there are 50 read errors corrected, so well done BTRFS for doing that (although the non-dup data is probably trashed). But the command "btrfs device stats /mnt/backup" reports that there are only 2 "read_io_errs". What's going on here? Does it only update the stats when the filesystem is unmounted or something? I'll probably partition the disk into two equal size partitions and keep using it for backups. That might not be so useful for backups (I also use good disks for backing up data) but should be good for testing BTRFS. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ -- 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
