RE: [Xen-users] AoE vs iSCSI

[Jeff Sturm <jeff.sturm@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Markus Hochholdinger
> Sent: Wednesday, March 17, 2010 3:37 PM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Cc: Chris 'Xenon' Hanson
> Subject: Re: [Xen-users] AoE vs iSCSI
> 
> i testet AoE and iSCSI. AoE scales very bad! If you have more than 10
AoE devices
> over one NIC you get on one AoE device bad througput and a high load
on the system.
> iSCSI with lots (testet with over 200) of LUNs will performe very
good. I was able to
> get a little more than 100MByte/s over one 1GBit/s NIC with iSCSI!

All other things being equal, one protocol should not outperform the
other by such a wide margin.  Your results obviously will depend on the
quality of the implementation--i.e. whether you've chosen one of the
open source AoE targets, or you are using a storage appliance with AoE,
which OS/driver version, etc.

AoE performance is also highly dependent on your network.  Always use
jumbo frames and hardware flow control.  If you have a switch that
doesn't handle these, get a new switch.

-Jeff



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