August 2, 20169 yr I would say replacing disks that haven't failed yet should be fairly low priority. If you upgrade to V6, unRAID will monitor the SMART for each disk and send you notification emails if anything doesn't look OK. Even if you don't care about any of the great new functionality for adding applications through dockers and VMs, the new V6 features also make unRAID a better NAS than v5.
August 2, 20169 yr Eventually I need to replace all the remaining Seagate ST3000DM001 drives as these have a nightmarish failure rate! https://www.backblaze.com/blog/hard-drive-reliability-q4-2015/ Keep in mind that while that model is way worse than others, it's still not 100% failure rate yet. There is a better than 50% chance that your drives will live a normally long life. I'd just keep an eagle eye on the smart stats, and replace at the first hiccup rather than watching for rate of decline.
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