When I was a lad and starting out in work an learning about servers and disks I was told of large corporations that regularly replaced storage drives to mitigate against failures.
They would start after x years of buying new storage and start replacing drives. They would, by the time they reached 3 or 4 years have replaced all the drives and be looking to cycle through again.
Things have moved on greatly since I heard this story and wondered if anyone does this, given the proliferation of SANs and often the complete replacement culture I've seen in many places.
The other thing I often find in small places is the lack of spare drives being used in RAID arrays. Whilst I can understand that if, you have spare drives somewhere close, you actively monitor the drives. However in the event of a failure over the weekend a spare can save you in the even you are running a less resilient RAID array or are unlucky.
Do people think that with RAID 10 that the likelihood of getting 2 drive failures in the same mirrored pair is really rare and so don't need spares.
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