Chapter 13.4.5. Host code upgrades
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Chapter 13. Maintenance 247 The exception to this rule is if you discovered that some part of your SAN is accidentally running ancient code, such as a server running a three year old copy of IBM Subsystem Device Driver ( SDD). 13.4.4 Preparing for upgrades Before performing any SAN switch or SVC upgrade, make sure that your environment has no outstanding problems. Prior to the upgrade, you need to: Check all hosts for the proper number of paths. If a host was for some reason not communicating with one of the nodes in an I/ O Group, it will experience an outage during an SVC upgrade, because nodes individually reset to complete the upgrade. There are some techniques that you can use to make this process ...
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