Re: [Xen-users] iscsi vs nfs for xen VMs

[Javier Guerra <javier@xxxxxxxxxxx>]

On Fri, Aug 7, 2009 at 8:48 AM, Jia Rao<rickenrao@xxxxxxxxx> wrote:
> I searched the Internet, it seems that iscsi is not intended for sharing a
> single LUN between multiple hosts.

the point isn't iSCSI, it's the filesystem in it.

a 'normal' filesystem (ext3, XFS, JFS, etc) isn't safe to mount at
multiple hosts simultaneously.

a cluster filesystem (GFS, OCFS, clusterXFS, etc) is specifically
designed for it.

in short, you have three options for sharing storage between Xen boxes:

1: NFS with file-based images
2: share a LUN, put a cluster filesystem on it, and put file-based images inside
3: multiple LUNs, each one is a blockdevice-based image

-- 
Javier

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