If you have not run a collection, start with option 1 collect disk
You'll find advice on the web, but you will need to query QUSRSYS/QAEZDISK
Be warned that the file created is fairly large. Depending on the amount
of room you have left you could end up exacerbating the problem. On my
1.9 TB system at 58% utilization, QAEZDISK is about 220 MB. YMMV.
You might consider purging QSYS of QHST* files, or using WRKOBJ *ALL/*ALL
*JRNRCV to find old journals that can be deleted first.
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