Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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## To perform planned maintenance on all HADB machines

Planned maintenance includes operations such as hardware and software upgrades. This procedure does not interrupt HADB availability.

1. For each spare machine in the first DRU, repeat the single machine procedure as described in To perform maintenance on a single machine, one by one, for each machine.

2. For each active machine in the first DRU, repeat the single machine procedure as described in To perform maintenance on a single machine, one by one, for each machine.

3. Repeat step 1 and step 2 for the second DRU.

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