Microsoft® Cluster Server (MSCS) users

WebSphere® MQ Version 6.0 and WebSphere MQ Version 5.3 contain components that provide MSCS support that were previously shipped in SupportPac™ MC74. If you install WebSphere MQ Version 6.0, you no longer need the SupportPac and you should not install it. The files included with WebSphere MQ Version 6.0 supersede those in the SupportPac.

If you are using SupportPac MC74 with your previous version of WebSphere MQ, uninstall before you install WebSphere MQ Version 6.0. You can upgrade the machines in your cluster without losing your configuration parameters by upgrading to WebSphere MQ Version 6.0 using a rolling upgrade, that is, upgrade each node in turn, waiting for one to complete before starting the next node.

If you want to install WebSphere MQ Version 6.0 into a different directory from that used by WebSphere MQ, you cannot use a rolling upgrade.