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

["Keld Jørn Simonsen" <keld@keldix.com>]

On Wed, Sep 15, 2010 at 05:25:02PM -0500, Stan Hoeppner wrote:
> 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. :)

yes, you are right. I meant Gbit/s

> 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. ;)

because I have seen specs given in bit/s. Eg southbridge speeds, and 
speeds of PCIe (2,5 Gbit/s per lane).  I agree that people probably want
speeds in MB/s.

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

I think so, too.

keld
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html