[CentOS] Possible to use multiple disk to bypass I/O wait?

[CentOS] Possible to use multiple disk to bypass I/O wait?

	Steven Tardy
	Jun 9, 2011 at 4:00 pm

On 06/09/11 11:48, Emmanuel Noobadmin wrote:
I'm going with noatime and ionice first

did you set noatime on the host filesystem and/or the VM filesystem?

i would think noatime on the VM would provide more benefit than on the host...
shrug. now my brain hurts. gee thanks. (:

--
Steven Tardy
Systems Analyst
Information Technology Infrastructure
Information Technology Services
Mississippi State University
sjt5 at its.msstate.edu

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Steve Thompson: If the server is reduced to a crawl, it's possible that you are hitting the dirty_ratio limit due to writes and the server has entered synchronous I/O mode. As others have mentioned, setting noatime could have a significant effect, especially if there are many files and the server doesn't have much memory. You can try increasing dirty_ratio to see if it has an effect, eg: # sysctl vm.dirty_ratio # sysctl -w vm.dirty_ratioP Steve

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[CentOS] Possible to use multiple disk to bypass I/O wait?

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