A RAID rebuild is the most stressful time period in the life of a drive. This is because the drive is busy servicing IO requests to rebuild the RAID set, while also servicing normal read/write IO requests. A drive is more likely to fail during a RAID rebuild. For this reason, it's a good idea to think about smaller RAID 5 sets, use RAID 6 or RAID-DP, or employ the use of a hot spare drive along with RAID protection.
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