mixing raid/non-raid?



I'm planning to install a 4 drive raid 10 system (or maybe raid 5 if I
can't get a raid 10 card that supports ata/sata)

I saw one article that said this:

"To ensure maximum performance, we used a separate drive (not
connected to the Promise controller) to hold the operating system and
applications so that we could use the FastTrak's Level 5 RAID as a
separate storage volume unencumbered by the operating system."

It strikes me as strange that if Raid 5 increases drive access time
that a seperate non-raid o/s drive would improve performance.

Is it good thinking? If so, should other applications (besides o/s)
reside on the non-raid drive too?


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