Re: advice to low cost hardware raid (with mdadm)

[Stan Hoeppner <stan@hardwarefreak.com>]

Keld Jørn Simonsen put forth on 9/15/2010 4:40 PM:
> These ports are connected to the
> south bridge often with 20 Tbit/s or more, while a controller on an
> 32 bit PCI only delivers 1 TBit. 

Tbit/s for 32/33 PCI?  I think you're a little high.. by a factor of
1000, Keld. :)

The chipset to processor interface on modern systems is typically around
8-16 GB/s, or 64-128 Gb/s.  That's still a factor of 10x lower than 1
Tbit/s, so you're high by a factor of 20x.

Why, may I ask, are you quoting serial data rates for parallel buses?
I've only seen inter-chip bandwidth quoted in serial rates on
communications gear.  Everyone else quotes parallel data rates for board
level communication paths-- Bytes/s not bits/sec.  You must work for
Ericsson. ;)

Regardless of bit rate values, we agree on the important part, for the
most part. :)

-- 
Stan
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