In next several months we will be setting up a mailing list for updates, we just need more time to put this in place. On 2819 we modified the block IO.

As stated before we do not have xen to test with this amount of servers connecting and if you start using Snapshots and replication with many accessing targets you will start to see the usage. So we wont be able to provide you anything on this, very hard to say without testing.

You will want to test settings on both the iSCSI initiators and our iSCSI daemon settings (must match) for MaxRecvDataSegmentLength & MaxXmitDataSegmentLength to start with.

I would be concerned with IO on the NIC's (Bond 802.3ad or Balance RR) and settings on the RAID (set for performance).