On Tue, Feb 24, 2009 at 07:55:03PM -0800, Matthew Ingersoll spake thusly: > I'm hoping somebody can verify my logic on how MPIO works with aoe/ > vblade.
Awesome timing. I was just looking into setting up MPIO also. iSCSI has MC/S and certain people in my shop are a big fan of it. I want to show that we can do the same thing with AoE and MPIO more simply. What distribution are you using? Do you find dm-multipath to be stable? > If an aoe target machine exported a file using a command like > > vbladed 0 0 eth0 /path/to/file > > and repeated this process using the same file to broadcast on a second > ethernet port: > > vbladed 0 0 eth1 /path/to/file > > On the initiator with 4 ethernet ports we would see: > e0.0 xyzGB eth0,eth1,eth2,eth3 up So the target has two interfaces but the initiator has 4? > The results are what I expected: > > In my write tests, I see traffic balancing on interfaces eth0-3. On > the target side, traffic flows on eth0-1 in what appears to be a round- > robin manner. On killing a single vblade, the throughput is almost > cut in half after aoe sees it as down. Almost in half? How linear is the scaling? I'm wondering what happens when we get 8 interfaces in a machine. We have quad port gig-e stuff in our lab. It would be fun to put two of them in each target and initiator. > My question then is, can corruption occur when having two vblades > running for the same file or is this the recommended MPIO method or > are there better solutions (this ones seems great to me)? AoE itself is stateless so that's a big plus. As both vblade processes are dealing with exactly the same kernel page cache I would expect it to be fine. I look forward to seeing what others have to say. -- Tracy Reed http://tracyreed.org
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