[Gllug] A SATA Raid card worth having?

Nix nix at esperi.org.uk
Wed Feb 1 00:58:54 UTC 2006


On Wed, 01 Feb 2006, Martin A. Brooks said:
> Nix wrote:
> 
>>raid5: using function: pIII_sse (1208.800 MB/sec)
>>
>>and, well, no disk I've ever heard of has that sort of bandwidth, and no
>>collection of disks you could reasonably hang off a PC does either
>>(what, that's 30 disks at 40Mb/s, and that's also way above PCI bus
>>bandwidth...)
> 
> You're confused.  This means that, if your processor is doing _nothing
> else whatsoever_, there's a slight chance it can compute raid5
> checksums at this speed.

Yes, context switches and cache and TLB pollution will slow it down, of
course. But by multiple orders of magnitude?

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