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Re: [libvirt-users] FYI: Notes on setting up KVM guests using iSCSI



On 05/05/2010 07:23 AM, Daniel P. Berrange wrote:
DV suggested that we document some libvirt setups using shared storage. I'm
not a fan of NFS, so I wrote some blog posts on how to use iSCSI in the
context of libvirt + KVM.

Thank you for creating and sharing these.

   http://berrange.com/posts/2010/05/05/provisioning-kvm-virtual-machines-on-iscsi-the-hard-way-part-2-of-2/

I have a question about this example, specifically the shareable permission option and tag: (perm=sh, <shareable/>)

What does that do, exactly? Is it simply the required r/w option to prevent corruption of VMs when using shared storage, or is it needed only if the disk will be actively by more than one VM? (That 2nd idea doesn't seem quite right to me, I would expect to have to use some kind of locking technology to prevent it two or more VMs trying to write to the same disk at the same time).

Thanks,
Tom


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