When using the virtio block device on the KVM guest, configure the system so that the major number of the virtio block device is the same on all nodes in the cluster system. A device type and a driver type should be the same on all nodes. If a type of the device to be connected or a driver to be used varies depending on each node, the major number may be different among the nodes. For example, if DM-MP is applied for the root partition for only some nodes, the DM-MP driver is loaded in a different order depending on each node. In this case, the major number of the virtio block device may vary.
Take the procedure below to check the major number of the virtio block device. The major number is 253 in the example below.
# cat /proc/devices | grep virtblk
253 virtblk |
If the major number varies on each node, change the setting of the driver so that the major number is the same on all nodes. For how to change the major number of the driver or how to change the installing order, see the manual of the driver, or contact the supplier of the driver.
