Gareth Pye posted on Tue, 01 Dec 2015 23:57:28 +1100 as excerpted: > Poking around I just noticed that btrfs de stats /data points out that 3 > of my drives have some read_io_errors. I'm guessing that is a bad thing. > I assume this would indicate bad hardware and would be a likely cause of > system crashes. Yes it's a bad thing and can indicate hardware issues. But something that has tricked a number of posters in the past... the stats numbers don't reset on reboot, they're meant to indicate errors over time and thus continue to increase until manually reset (stats -z displays and resets). In particular, if you had a system crash or hard power-down, it likely left some errors (fixable by scrub if you're running dup/raid other than raid0) that will show up when btrfs comes across them, that don't necessarily mean hardware problems (other than likely lack of a UPS). Because the numbers don't reset unless you do so manually, that crash/ hard-power-down could have been months ago... So yes it's a bad thing, but potentially not as alarming as you might have first thought, if you had incorrectly assumed those error counts were since last boot. =:^) -- 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
