Why am I getting a Version Mismatch Error?

This message means you have different versions of I/O Express on your cluster. It usually happens after upgrading I/O Express when you do not reboot all of the nodes of your cluster simultaneously. By rebooting one node at a time you have a situation, where the rebooted node and at least one node which has not been rebooted yet, have different versions of I/O Express. Even though this condition will not continue for long (you would be rebooting each node with the new driver very soon), a bit is set, indicating the mismatch.

The Version Mismatch Error can be avoided by either of the following:

1. Reboot all nodes simultaneously. At no point during a simultaneous reboot will two different versions of I/O Express be present.

2. Comment out the IOX_STARTUP command in your System Startup file. You may then reboot one machine at a time to remove the I/O Express driver from each machine. AFTER the entire cluster has been rebooted to remove the old driver, enter @IOX_STARTUP or @IOX_STARTUP "/NOAUTOMATIC" from the dollar prompt on EACH node to load the new driver on that node. All nodes MUST have I/O Express loaded in order for caching to occur on the network. If even one node does not have I/O Express started, even if in NOAUTOMATIC mode, no caching will occur on any node of the cluster.

If this FAQ helped, please let us know. If you didn't find the answer to your question here please e-mail

Executive Software Europe