Re: [Xen-devel] AOE

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 May 2005, at 05:51, James Harper wrote:

> If anyone is wanting to experiment with SAN technology, but finding
> iSCSI too fiddly, have a look at AOE (ATA over Ethernet). There is a
> software AoE server, and the kernel client is already in 2.6.11.
>
> I use AOE root on dom0, and on the block devices exported to the other
> domains (eg dom0 exports AOE devices, the other domains don't do AOE
> themselves). This allows for domain migration to work nicely.
I'm surprised that the protocol packets don't include an end-to-end 
checksum. If the packets pass through a switch that occasionally 
garbles packets then you could end up committing erroneous sectors to 
disc.
On the other hand, if this is a significant problem then NFS/iscsi IP 
checksumming may not save your data either, since the IP checksum is so 
weak. For large volumes of data you care about the integrity of, you 
probably really want an end-to-end CRC.
 -- Keir


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