Quote:
Originally posted by Joe
RAID5 has the nasty drawback of either: 1. terribly high CPU use on "soft" controlers, or controlers with bad drivers. and 2. Slow write speeds to the disk. ( the write speeds arent much better than one single disk alone I have found) this is also why most high end DB mfg's do not recomend running the DB on a RAID5.
to me performance is as important as stability ( which is why I run SCSI... its the perfect blend of both). I would not sacrifice performance to give me a 1 disk tollerance. RAID 3 in some respects is better than 5. Less CPU use, less Controler CPU use, and you still get the one drive redundancy.
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Yes, I agree, I went with IDE raid because I wanted size for the buck, over speed, and while I avoid the first drawback you mentioned, I do tend to have somewhat slow write speeds, but that is an acceptable drawback in my mind when I have other drives to do my swapping and more temporary file storage.
And raid 3 only has less cpu usage if you have a bad raid card, and it writes a lot slower because you have the dedicated parity drive rather than spreading that info out among the drives.