Going forward, i'd make a practice of keeping the directories that you want to operate cache in owned by the cache user (cacheusr) and the group. Also, doing a ccontrol start as root will typically provide permissions that these issues won't come up. Root is especially useful later when record locking comes into play
I'm guessing it is a permissions issue. I would start by opening the directory up
chmod 777 /home/centos
Better yet, are you starting caché as the root user? That might help considerably
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This looks more like the menu for compacting free space rather than compacting globals. Compacting free space is a bit less IO intensive and probably a more viable option given the amount of Disk Free indicated. After free space is compacted it can be returned to the file system by truncating the database.