[Linux-PowerEdge] KVM Disk Format Options

Jose_De_La_Rosa at Dell.com Jose_De_La_Rosa at Dell.com
Wed Feb 20 14:58:31 CST 2013


I did not mean to imply that you need iSCSI for VM migration, I was referring to storage pools and volumes (which can be iSCSI and NFS).

Jose De la Rosa
Linux Engineering
Dell | Enterprise Solutions Group

From: Dan Pritts [mailto:danno at umich.edu]
Sent: Wednesday, February 20, 2013 2:54 PM
To: De La Rosa, Jose
Cc: meshvic at gmail.com; linux-poweredge-Lists
Subject: Re: [Linux-PowerEdge] KVM Disk Format Options

The answer may be different depending on your storage vendor; some of them have better NFS performance (i'm looking at you, netapp) and others are better at iscsi.   So, I'd ask EMC what they recommend.

Jose, is it really true that you need iscsi to do live VM migration with KVM?  That is not true with vmware; NFS works too.

Jose_De_La_Rosa at Dell.com<mailto:Jose_De_La_Rosa at Dell.com> wrote:

I don't know of existing Dell whitepapers that have studied performance of block vs. file-based storage, but the statement below makes sense, as using block storage avoids having to use the file system layer on the hypervisor. When using iSCSI-based storage pools and volumes (required for live VM migration) the default storage type will be block based.

Jose De la Rosa
Linux Engineering
Dell | Enterprise Solutions Group

From: linux-poweredge-bounces-Lists On Behalf Of Mesh
Sent: Wednesday, February 20, 2013 1:04 AM
To: linux-poweredge-Lists
Subject: [Linux-PowerEdge] KVM Disk Format Options

Good day,

We are implementing a multi-node system based on KVM that will have high disk I/O and I'm doing some research so that I can advise whether to use block devices (LUNs) for our VMs, or image files. I'm getting confusing messages, depending on where I look, including some Dell white papers that I could access.

Dan Pritts
ICPSR Computing & Network Services
University of Michigan
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