Clearing SMART errors I don't care about?
I have a 250GB drive that I use exclusively for unimportant data. I run smartd to watch the status of my drives and get regular output like: smartd[1409]: Device: /dev/ad8, 4 Offline uncorrectable sectors I've been seeing that exact message for a couple of years now and don't particularly care. I'd like to know if the drive's about to roll over and die, but I really don't need to know about the same 4 offline uncorrectable errors. Is there a way to clear that message while leaving SMART enabled on the drive? I didn't see anything specifically answering it in smartctl(8) but wondered if I missed something. -- Kirk Strauser ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
smartd to watch the status of my drives and get regular output like: smartd[1409]: Device: /dev/ad8, 4 Offline uncorrectable sectors I've been seeing that exact message for a couple of years now and don't particularly care. I'd like to know if the drive's about to roll over and die, but I really don't need to know about the same 4 offline uncorrectable errors. Is there a way to clear that message while leaving SMART enabled on the drive? I didn't see anything specifically answering it in smartctl(8) but wondered if I missed something. maybe some time there was an error while writing something, or maybe media failed in that place. by rewriting whole drive you should be able to remove them ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
On Dec 19, 2008, at 10:03 AM, Wojciech Puchar wrote: by rewriting whole drive you should be able to remove them I tried running dd if=/dev/zero of=/dev/ad8 bs=1m a while back but I'm still getting them. At this point, I imagine that I really do have bad sectors. I'm fine with that. I just don't want to hear about them any more. :-) -- Kirk Strauser PGP.sig Description: This is a digitally signed message part
Re: Clearing SMART errors I don't care about?
On 12/19/08 11:46 AM, Kirk Strauser k...@strauser.com wrote: I just don't want to hear about them any more. :-) reconfigure smartd? i'm not convinced that smart monitoring is of much value even on disks with important data. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
On Dec 19, 2008, at 11:10 AM, James Tanis wrote: To answer your question, I don't believe smartd is sophisticated enough to filter out specific errors. It's meant to warn you at the first sign of drive failure so you will have time to replace the drive. It doesn't exactly provide a meter of how imminent drive failure is. If your going to start ignoring it's advice it isn't going to be very useful to you at all. I beg to differ. smartctl -H /dev/ad8 says that it passes its self- assessment and doesn't expect the drive to flat-out die any day soon. I'd still like to know if the error count increased, or if it started to detect imminent failure. -- Kirk Strauser ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
Hi, i'm not convinced that smart monitoring is of much value even on disks with important data. It is if taken seriously. A smartd error was once ignored, the rest (including data) is history. Thank you for FreeBSD! -- Zbigniew Szalbot www.fairtrade.net.pl www.slowo.pl ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
On 12/19/08 12:38 PM, Kirk Strauser k...@strauser.com wrote: I beg to differ. smartctl -H /dev/ad8 says that it passes its self- assessment and doesn't expect the drive to flat-out die any day soon. I'd still like to know if the error count increased, or if it started to detect imminent failure. there are plenty of hdd failure modes that smart can't predict. google's monitoring of over 100,000 hdds over 9 months showed more than a third of failures had no warning from smart. http://storagemojo.com/2007/02/19/googles-disk-failure-experience/ so if my data matters, i need a robust hdd failure-tolerant system anyway, i.e. raid (even if it's just gmirror, which i use for non-critical servers) plus data snapshots to a remote site. now, with that in place, what do i do with a smart warning? given that smart algorithms are also prone to false positives, is there any benefit in replacing the hdd now rather than waiting for it to fail and replacing it then? not a great deal in my view. but perhaps my raid array can't tolerate more than one hdd failure. i'd be exposed to a second disk failure during the time to repair. if hdd failures are independent (which i guess might not always be true) this isn't a big concern. less of a concern than, for example, the chance of raid controller failure, which i've seen happen. one time when that happened, the controller corrupted all the disks in the array and when it was replaced rebuild was impossible. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
failures had no warning from smart. http://storagemojo.com/2007/02/19/googles-disk-failure-experience/ which means that in 2 cases of 3 you ARE warned. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Clearing SMART errors I don't care about?
On 12/19/08 2:51 PM, Wojciech Puchar woj...@wojtek.tensor.gdynia.pl wrote: which means that in 2 cases of 3 you ARE warned. yes. but what do i do with a smart warning? the google paper indicates that even they haven't figured it out yet, although they express some hope. Despite those strong correlations, we Þnd that failure prediction models based on SMART parameters alone are likely to be severely limited in their prediction accuracy, given that a large fraction of our failed drives have shown no SMART error signals whatsoever. This result suggests that SMART models are more useful in predicting trends for large aggregate populations than for individual components. in managing my servers, it's the failure of individual components that count. considering also 1) false positives and 2) replacement comes with a finite chance of causing service outage, it's not clear to me that replacing a disk on the basis of a smart warning is prudent. i'm not proposing any firm conclusions should be drawn. i started this by saying i'm not convinced that smart monitoring is of much value... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
