On Dec 28, 2005, at 10:30 PM, Yeechang Lee wrote:
To make a long story short, my 2.8TB JFS-on-LVM2-on-software RAID 5 array has certain mysterious performance bottlenecks that result in 7.5-10MB/s local write speeds, despite eight spindles and two 3Ware 7506 controller cards in JBOD mode and on separate buses and with iowait never going above a few percentage points at the very most. Over the network that's even slower, of course.
This actually sounds pretty typical of RAID 5 to me. Every write results in 2 simultaneous writes. Even slower when you're doing it in software. Great for redundancy, terrible for throughput. That's the trade-off.
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