PRIMECLUSTER Global Disk Services Configuration and AdministrationGuide 4.6

4.6.3 Setting up Shared Disk

When using a shared disk on the KVM guest, set [Shareable] and then set [none] (cache='none') to [cache model].

The setting procedure is as follows:

For virtio block device

1. Stop the guest OS.

2. Select the stopped guest OS from the Virtual Machine Manager and click the [Open] button in the tool bar.

3. Click in the tool bar of the displayed window to display the detailed information of hardware.

4. Select a virtual disk [VirtIO Disk] from the hardware list in the left.

5. In the [Virtual disk] window, perform the following settings and click the [Apply] button.

   • Select the [Shareable] check box.

   • Select [none] for the [cache model] list.

For virtio-SCSI device

Describe "shareable" and "cache='none'" in the guest configuration file (/etc/libvirt/qemu/guest_name.xml) on the host OS according to the following description while a guest OS is being stopped.

# virsh edit guest_name

Example;

<disk type='block' device='lun'>
  <driver name='qemu' type='raw' cache='none'/>
  <source dev='/dev/disk/by-id/scsi-36000b5d0006a0000006a1296001f0000'/>
  <target dev='sdh' bus='scsi'/>
  <shareable/>
  <address type='drive' controller='0' bus='0' target='0' unit='7'/>
</disk>