Re: RAID5 no longer has a role with hard drives
To that I say, so what? Use RAID6 and don't worry about a 72 hour rebuild time. What difference does it make how long it takes, so long as you don't have two more failures during that time? Back in the day you cared how long it took because it caused increased latency for regular I/O. It still will, but since your latency sensitive stuff is on SSD now, you don't really care if the nominal 10 ms response time becomes 15 ms for a few days. All your hot data / hot blocks should be on flash.