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11-23-04, 10:21

matssve

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Join Date: Sep 2004

Location: Stockholm, Sweden

Posts: 28

RAID levels

Not sure if this thread belongs here but I didnt find any better group.

It seems to bee a common opinion that RAID levels 0+1 (first stripe, then mirror) and level 1+0 (first mirror, then stripe) have better write/read performance and higher reliability than the more common RAID level 5 in a OLTP system.

The higher reliability is easy to understand, but can someone explain why read/write performance is better. Is it only because of parity calculations in RAID 5?

/Mats

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