From: Stan Hoeppner <stan@hardwarefreak.com>
To: linux-raid@vger.kernel.org
Subject: Re: advice to low cost hardware raid (with mdadm)
Date: Wed, 15 Sep 2010 17:25:02 -0500 [thread overview]
Message-ID: <4C9147BE.60200@hardwarefreak.com> (raw)
In-Reply-To: <20100915214013.GA19900@www2.open-std.org>
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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next prev parent reply other threads:[~2010-09-15 22:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-15 20:07 advice to low cost hardware raid (with mdadm) Pol Hallen
2010-09-15 20:41 ` Stan Hoeppner
2010-09-15 21:40 ` Keld Jørn Simonsen
2010-09-15 22:25 ` Stan Hoeppner [this message]
2010-09-16 12:05 ` Keld Jørn Simonsen
2010-09-15 22:03 ` Pol Hallen
2010-09-15 23:56 ` Stan Hoeppner
2010-09-16 22:41 ` Michal Soltys
2010-09-17 0:42 ` John Robinson
2010-09-17 4:38 ` Stan Hoeppner
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