On Mon, May 09, 2011 at 05:53:49PM +0200, Torbjørn Thorsen spake thusly: > As I applied all your advice at the same time, I'm not quite sure what > made the biggest impact
Oops...And I almost mentioned be sure to do each one at a time then test so we would know which one did it. :) > The result was that my AoE benchmarks now outperform the iSCSI alternative. Excellent, just as it should be! Just out of curiosity, by how much does AoE outperform iSCSI? iSCSI might be made to go a bit faster if as much effort were put into optimizing it as we have AoE. > I'm using HP ProCurve 2510s. That's what I use also. > Flow control in the switch was not enabled, and I can't remember > seeing that one mentioned too many places either. Yeah, it helps the switch out a lot. The only time you should not use flow control is if you are using one of either VLAN tagging or bonding, I forget which and why. > Wouldn't you know, I had not included the respective ports in the > jumbo-enabled VLAN. After enabling the ports on the switch, I verified I had > a 9000 MTU by using ping with the "prohibit fragmentation" option enabled and > sending frames bigger than 1500 bytes. Yep, that would do it. > As for data safety, should I consider running vblade with the O_SYNC > option enabled ? You might want to give it a try but I have found that it hurt performance unacceptably unless you have a hardware RAID controller with battery backed cache. Using O_SYNC works out well in that case because the controller will cache for you reliably and not lose the data in a power failure. > I will be exporting block devices to be used as the filesystem for Xen > instances, and I wouldn't want to lie to MySQL living in Xen about > data being on disk. That is exactly what I do also. > Using the raw device here as well, I don't see the need for > partitioning at this level. Good. Glad you got your performance issue fixed. I have strugged with many myself over nearly 6 years of using AoE and I what I gave you is my standard formula for always getting max performance. -- Tracy Reed
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