November 25, 201312 yr I have a number of WD20EARS and WD20EFRX drives that are reaching capacity and I'd like to replace at least one of them with a 4TB but I'm not sure which one(s) to remove. The drives are working fine as far as I can tell and I'm not adept enough at comparing smart reports. Some are out of warranty so I figured I'd start there. Anything else to consider, from the smart reports specifically? BTW: Could this ever be made an unraid feature - running smart reports across drives and having it pick the best candidate to replace?
November 25, 201312 yr Look at the smart reports from each drive, specifically "reallocated sectors count", "current pending sectors count", and "offline uncorrectable". If any of the drives show a raw value higher than 0 on any of those attributes, I'd replace those drives first.
November 25, 201312 yr Unless there are notable issues with the SMART reports, I'd simply replace the out-of-warranty drive with the most power-on hours. Note that these drives are then excellent drives to use for backups.
November 25, 201312 yr Reallocated or pending-reallocation counts [as suggested by dirtysanchez) definitely qualify as "notable issues with the SMART reports ] Replace those first ... then use my power-on-hours metric.
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