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From Conrad Geiger <>
Subject Re: How many vms per primary storage can offer best performance?
Date Thu, 04 Jul 2013 16:26:05 GMT
I would also say that 8 spindles for 15-20 VMs is low.  You are going to run out of iops.

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-------- Original message --------
From: Ahmad Emneina <>
Date: 07/04/2013 9:10 AM (GMT-05:00)
To: Cloudstack users mailing list <>
Subject: Re: How many vms per primary storage can offer best performance?

I would google NFS tuning and atomically test changes. Changes vary from
the kernel level up through the switches (sizing frames) as well as
introducing bonding. YMMV here NFS tuning is a huge part trial and error.

On Thu, Jul 4, 2013 at 5:26 AM, WXR <> wrote:

> I use NFS share as primary storage,the NFS share is on a 8 SATA HDDs
> RAID10 volume.
> The network link is gigabit ethernet.The switch is dell powerconnect.
> When I just create 15-20 vm instances and start them(not run any software
> on them),I find the disk IO performance of the vm is very low.
> If a file copy job on a pc needs 10 minutes , the same job on the vm needs
> 20minutes.
> I don't know if it is normal,and I want to know the correct configuration
> of the primary storage,I need your suggests with enough experience.

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