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Please note that the information collection does not cover node-specific files by default (to keep the zip file small); if you want to also collect node-specifics for one or more nodes add the argument node=<nodename1>,<nodename2>... (or node='*' to cover all nodes) to the tool invocation.
The support tool limits the size of the resulting zip file to 10 megabytes, if necessary by truncating log files. If this does not reduce the size sufficiently the support tool will report that it cannot meet the target zip size and abort; In this case you should rerun the support tool with a larger maximum for the zip file (e.g. maxzipsize=31457280 for 30 megabytes). This is not a common occurrence and you should investigate why such overly large amounts of data were present in logs and configuration.