On Wed, Nov 10, 2010 at 11:09:16AM -0600, David Leach spake thusly: > I've been looking at AoE and I'm trying to understand what affect the > Ethernet CRC-32 data integrity checking has on the AoE communications?
I too have been wanting to better understand the error correction facilities of AoE. So far I have never run into any trouble that I am aware of. > Has anyone done any analysis or have any response to AoE's ultimate > reliability for missed error detection of bad frames? I suspect it is sufficiently low as to not be an issue. You have to multiply the chance of an error by the chance that the error would not be caught due to being a 32 bit crc. > I think that there is a further problem to understand and that is with > network connection points. AoE is not routable but that doesn't mean you > can't use network switches to interconnect initiators with their AoE targets > and at these switches there seems to be a possible error point introduced > which AoE isn't protecting against? Are there best practices for AoE > installations to protect against these error points? AoE is not layer 3 routable. It is routable in general with spanning tree etc. You can also implement an ethernet tunnel (being careful of MTU concerns etc). I think the genious of AoE vs iSCSI is in adhering to the separation of concerns of each of the layers of the network stack. -- Tracy Reed http://tracyreed.org
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