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Re: [Qemu-discuss] SSD tuning

From: Alberto Garcia
Subject: Re: [Qemu-discuss] SSD tuning
Date: Thu, 11 Aug 2016 15:34:33 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

On Mon, Aug 08, 2016 at 04:12:06PM +0000, Tim Bell wrote:

> Any suggestions for how to tune KVM for SSDs on the hypervisor ?
> We’re seeing a significant drop (50%) of IOPS for random write
> from guest to host.

If you're using qcow2, you are doing random I/O and you have a
sufficiently big virtual disk, chances are you need to increase the
cache size:

Take a look at this:



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