[Gllug] Production system - Linux 2.4.24, LVM and cciss

[Dale Gallagher]

> RAID5 buys you more space, RAID10 a little more redundancy. There was

I _specifically_ want the added redundancy of RAID 1+0.  I'm also
aware that RAID is built on the concept of parallelism, so more disk
spindles will obviously improve overall performance.  Also, mirroring
writes to 2 disks simultaneously, I know.  I don't have enough
experience with RAID to make a judgment, but I'm curious as to why all
the literature I've found favours RAID 1+0 over RAID 5 in overall
performance? Could anyone point me in the direction of any "real world"
benchmarks, or appropriate theoretical analyses?

At this stage the RAID 1+0 seems to be the best for my simple
requirements, based on my research.  However, I'd welcome further info
regarding real-world scenarios, as this system will grow substantially
in the future and then RAID 1+0 may not necessarily fit the bill.

P.S. I've spoken to someone who runs a huge qmail cluster and
apparently RAID 1+0 way outperforms RAID 5;  qmail's performance being a
fundamental component of my system therefore warrants the use of an
appropriately more suitable RAID solution for the requirement.  Anyone
else out there who runs a _very_ large qmail setup?
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