# Disk 88%: compress idle chain tape b051-b058 (~8.4 GB -> ~2-3 GB)
Classifier blocked my run (rm of originals). Script: /opt/crew/work/ppdata/zchain.sh (zstd -3 nice/ionice, test, rename to .zst, then remove original). Readers (r6tape.py, r6nat*.py, stocks.py) need `zstd -d` first if rerun.
xfer10.db: /opt/ppcopy/xfer10.db and /opt/sw/dataeng2/xfer10.db are byte-identical (570 MB); dataeng2 owns one: replace one with a symlink (ops or dataeng2).