I have recently been doing a fair bit of WAS work on zOS, going back to where it started for me in the WebSphere world.
On one of the systems we had an application that was running out of memory regularly, creating heapdumps and then filling the filesystems so WAS wasn't able to restart itself. To get round this we created a new large filesystem and redirected the heapdumps to this FS using the following generic JVM argument for the servant process:
-Xdump:heap:defaults:file=/WASdumps/heapdump.%Y%m%d.%H%M%S.%pid.phd
Where /WASdumps was the new filesystem
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