Messages in this thread | | | Date | Sun, 28 Dec 2003 22:56:44 +0100 | From | bert hubert <> | Subject | Re: Best Low-cost IDE RAID Solution For 2.6.x? (OT?) |
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On Sun, Dec 28, 2003 at 01:35:35PM -0800, Johannes Ruscheinski wrote:
> Fisrt of all: thanks for the advice Joel! Two questions: why not use the > hardware raid capability of the Promise tx4000 and if we'd use software > raid instead, what would be the CPU overhead?
For the cost differential between linux native RAID and an external device of similar capabilities, outfit yourself with an additional CPU. I don't use RAID5 a lot but to a modern CPU, checksumming dozens of megabytes/second is child's play:
raid5: measuring checksumming speed 8regs : 1479.600 MB/sec 32regs : 744.400 MB/sec pIII_sse : 1649.200 MB/sec pII_mmx : 1806.000 MB/sec p5_mmx : 1915.200 MB/sec raid5: using function: pIII_sse (1649.200 MB/sec)
This is on a 800MHz Celeron, so a recent >2Ghz system will do lots better still.
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