On Thu, 2007-01-18 at 12:50 -0700, Rick McNeal wrote: > > On Jan 18, 2007, at 12:00 PM, Mark A. Carlson wrote: > > > I would imagine the argument is that of software drivers > > for the storage stack consume much less overhead by > > cutting out the IP part - less CPU consumed, perhaps > > better throughput. As far as cost, it leverages the NIC > > commodity pricing curve without requiring TCP offload. > > > > > The amount of CPU speed being consumed is really only valid for > underpowered machines. Any modern desktop has more then enough > horsepower to completely fill a 1GbE link with traffic at 4KB packet > sizes. If the storage array can't handle that level of network load > then an TOE is a viable solution since the price point of TOEs for a > big array would be acceptable. So, loosing the ability to route > packets and lack of security is bad enough, but there's an overlooked > fact that the ATAoE protocol still has to deal with packet loss and > retransmission. So, is the protocol overhead really that much less?
you forgot: a) simplicity of AoE spec which leads to more stable implementations/solutions, hence AoE implementations gains uptimes... b) vfs/application overhead eats CPU too, so by excluding TCP/IP, AoE gains performance... c) TOE are dead-end solutions. > > -- mark > > > > Adam Leventhal wrote: > > > On Thu, Jan 18, 2007 at 03:13:51PM +0000, Darren J Moffat wrote: > > > > > > > As a security person one of the things that interests in comparing ATA > > > > over Ethernet with iSCSI is that with the later you get to use IPsec to > > > > provide transport layer security and that seems like a big plus to me. > > > > > > > I think the idea of AoE is that you don't have IP, you're not routable, > > > and you're necessarily on a dedicated network. Frankly, I don't see the > > > utility over iSCSI. > > > > > > Adam > > > > > > > > _______________________________________________ > > storage-discuss mailing list > > [email protected] > > http://mail.opensolaris.org/mailman/listinfo/storage-discuss > > ---- > Rick McNeal > > > "If ignorance is bliss, this lesson would appear to be a deliberate > attempt on your part to deprive me of happiness, the pursuit of which > is my unalienable right according to the Declaration of > Independence. I therefore assert my patriotic prerogative not to know > this material. I'll be out on the playground." -- Calvin > > > > _______________________________________________ > storage-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/storage-discuss -- Erast _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
