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Disk IO

If i go from 12 scsi 15000 RPM drives down to 8 15000 RPM drives what would my decrease in io be?  
1 Solution
It will decrease by 4 spendles IO. IO is based on number of spendels (disks) in a RAID. More number of disk will give you more disk IO.
Duncan MeyersCommented:
Approximately 2400 IOPS, 4800 IOPS sustained peak (assuming RAID 5) to 1600 IOPS, 3200 sustained peak. Disk bandwidth will be in the order of 150MB/sec down to 120 MB/sec assuming random I/O patterns - bandwidth will be up to 10 times that for sequential I/O. Note that sustained peak figures are an absolute maximum - anything above that and performance will fall off a cliff.

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