|
Le 06/07/2011 11:17, Torbjørn Thorsen a écrit : What filesystem do you use? XFS is known to be the recommended filesystem for AoE.2011/7/5 Tracy Reed <tr...@ultraviolet.org>:On Tue, Jul 05, 2011 at 05:03:40PM +0200, Torbjørn Thorsen spake thusly:I'm setting up a AoE-based SAN, and I'm not quite sure I've reached a good performance level.I can read and write the raw AoE device (/dev/etherd/*) at more or less line-speed on my 1gig Ethernet adapters.This means I'm seeing I/O rates of 100 to 120 MB/s when using dd or something similar.This is in line with what I get also. Sounds like your performance level is as expected (very good).However, when I put a filesystem on there, I'm seeing rates of 55 to 70 MB/s. I've tested mostly by using rsync, cp or dd, but I tried bonnie and saw much the same results.Yep. You are most likely running into physical limitations of the disk.I should have mentioned that the AoE device is backed by a RAID setup that is able to write well above 120 MB/s. If I mount the same filesystem locally, on the server, bonnie tells me it's able to do sequential writes at ~370 MB/s. If I write straight to the AoE device, I can get the expected line-speed of the network, around ~110 MB/s. dd if=/dev/zero of=/dev/etherd/e1.1 bs=1M However, when mounting a filesystem, and copying a file onto the AoE device, I only see about ~70 MB/s. This leads me to thinking that the performance degradation I'm seeing is related to the filesystem or the network. Of course, I wouldn't expect a filesystem to give the same performance as the raw device, but I didn't expect to see a ~25% hit in performance, especially when doing a sequential write. Tracy Reed Digital signature attached for your safety. Copilotco Professionally Managed PCI Compliant Secure Hosting 866-MY-COPILOT x101 http://copilotco.com --
|
<<attachment: a_chapellon.vcf>>
------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2
_______________________________________________ Aoetools-discuss mailing list Aoetools-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
