All other SMART data are zero besides the 5 Reallocated sectors. The thing that indicates failure is a GROWING number of r-s counts. I have a couple NASes that track r-s counts and report if they grow. One here and there makes no difference. I have disks that will get one or two in say a year and continue to run fine (some for many many years now). But if you see them begin to creep up over a period of a few days or a few weeks then the disk will likely fail.
-Tom On Jun 18, 2013, at 4:18 PM, Przemek Klosowski <przemek.klosow...@gmail.com> wrote: > On Mon, Jun 17, 2013 at 9:53 AM, Tom Easterday <tom-...@bgp.nu> wrote: >> File system check claims the disks are fine. SMART shows 5 reallocated >> sectors and everything is good. > > No, it's not. First of all, check if you have Current Pending > sectors---those are ones that were written to but can't be read back, > so they can't be retired/reallocated. The firmware recovery for this > condition usually takes a long time (firmware retries, recalibrates, > etc), and OS recovery may be flaky. If you have CPS, you need to find > the sectors and overwrite them, which will allow reallocation. > > Furthermore, Google did a study ( > http://research.google.com/archive/disk_failures.pdf ) showing that > reallocated sectors are a significant future failure predictors, so > replace that baby while you can. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users