Hi On 03/07/2016 01:29 AM, Phil Turmel wrote: > I replace drives when their relocation count hits double digits. In my > limited sample, that's typically after 40,000 hours. It really depends a lot on the drive type and manufacturer (for example see the various reports by Backblaze). We run quite a number of "desktop" style drives and many have seen 60k and more power on hours, but then our data collection is a bit biased as we replace disks once they do not complete a "long" smartcheck (smartctl -t long). I've attached a sorted list of current data, columns are mostly: manufacturer model number reallocated sectors (ID 5 of smartctl -a) power on hours (also according to smartctl -a) So, not sure one could infer much from these lines due to the inherent bias. Personally, I would monitor the number of reallocated and pending blocks, run short tests often and long tests about once a week. This should give you at least some hint, if a drive may go down. And if it does unexpectedly, you should be covered by RAID6. Cheers Carsten
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