Having some sort of parity or mirror
drive should be a given.
I recall a hardware colleague who once said to me, ???Losing one drive, yeah, that could happen, but
the odds of losing two or more are astronomical.??? For the longest time, I repeated that mantra, focusing
on cost and potential array performance rather than protecting data. I personally learned my lesson
when my own server lost not one, not two, not three, but four of its six drives within a week. Apparently,
a bad batch of drives had hit the market, and my server was lucky enough to house them. These were
quality, expensive drives as well, with a respectable MTTF rating.
CHAPTER 10 n HARDWARE CONSIDERATIONS 251
RAID 0+1 and RAID 1+0
RAID 0+1 and RAID 1+0 both represent ways of combining striping (RAID 0) with mirroring
(RAID 1) to gain performance while still maintaining solid protection against
drive failure. Sometimes the plus sign (+) is omitted. In particular, RAID 1+0 is often
referred to as RAID 10. However, one thing to watch out for is that some vendors use
the term RAID 10 to refer to what is really RAID 0+1.
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