Re: [Xen-users] AoE (Was: iscsi vs nfs for xen VMs)

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

John Madden wrote:
> > Getting somewhat off-topic, but I'm interested to know how AoE
> > handles network errors ? I assume there is some handshake to make
> > sure packets were delivered, rather than just "fire and forget" !
> Ethernet itself has checksumming and error correction, so all of 
> this is handled in layer 2.
As Javier points out, it only drops frames detected to have errors. 
To have an error corrected link you either have to do it yourself or 
use TCP.
Also, in the context of paralleling multiple links across dual 
switches to provide redundancy, you could also lose frames in transit 
if a switch failed.
I must admit, AoE does seem to have it's upsides - in past threads 
(here and elsewhere) I've only ever seen it being criticised.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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