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Improving disk performance?

asked 2011-11-02 22:44:36 -0500

justin-fathomdb gravatar image

I'm using OpenStack Diablo with KVM, and disk performance in the guest is not great. Are there any tips for better disk performance?

For example:

Turning on writeback caching is supposed to help (at the expense of reliability) Switching from ext4 to ext3 is supposed to be a big improvement Presumably the normal tricks like noatime etc will help Using a raw disk image rather than a qcow2 disk image could be faster Switching to a raw LVM partition should be much faster Mounting "scratch" space (presumably a separate LVM partition again) should be faster than using the root image

Does anyone have any experience with how to get better performance? Any recommended tweaks?

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answered 2011-11-02 22:53:11 -0500

vishvananda gravatar image

Use lxc?

Seriously though, the testing I did long ago had perfectly reasonable disk performance. You could try --nouse_cow_images and see if it helps.

On Nov 2, 2011, at 3:45 PM, justinsb wrote:

New question #177332 on OpenStack Compute (nova): https://answers.launchpad.net/nova/+q...

I'm using OpenStack Diablo with KVM, and disk performance in the guest is not great. Are there any tips for better disk performance?

For example:

Turning on writeback caching is supposed to help (at the expense of reliability) Switching from ext4 to ext3 is supposed to be a big improvement Presumably the normal tricks like noatime etc will help Using a raw disk image rather than a qcow2 disk image could be faster Switching to a raw LVM partition should be much faster Mounting "scratch" space (presumably a separate LVM partition again) should be faster than using the root image

Does anyone have any experience with how to get better performance? Any recommended tweaks?


You received this question notification because you are a member of Nova Core, which is an answer contact for OpenStack Compute (nova).

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Asked: 2011-11-02 22:44:36 -0500

Seen: 146 times

Last updated: Nov 02 '11