SS and AFPS Volumes
Hello.
I am not a storage engineer so forgive my ignorance. On Catalina there are two volumes, Macintosh HD and Macintosh HD - Data.
In SS I have it set to keep a minimum of 100gb free on the startup disk (Macintosh HD), does SS treat Macintosh HD - Data as part of the startup disk or an other disk? The reason for the question is on two occasions the MacOS was rendered unusable because Macintosh HD - Data was out of space and filled with daily Time Machine snap shots.
Both times the situation was easily resolved but trying to prevent it in the future.
I am not a storage engineer so forgive my ignorance. On Catalina there are two volumes, Macintosh HD and Macintosh HD - Data.
In SS I have it set to keep a minimum of 100gb free on the startup disk (Macintosh HD), does SS treat Macintosh HD - Data as part of the startup disk or an other disk? The reason for the question is on two occasions the MacOS was rendered unusable because Macintosh HD - Data was out of space and filled with daily Time Machine snap shots.
Both times the situation was easily resolved but trying to prevent it in the future.
Comments
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The dual volumes with AFPS (one with the volume name, one with "Data" appended) is a feature of this format that provides a read-only system volume. This is explained in this Apple help document: About the read-only system volume in macOS Catalina.
However the AFPS disk should appear as a single volume in the Finder, and to apps like SecuritySpy, so you shouldn't have to worry about this implementation detail.
SecuritySpy can an AFPS disk for capture, but when this is also the system disk, there could be problems in terms of interactions with Time Machine (which can fill the disk with temporary snapshots from time to time, as you have discovered). Therefore, for SecuritySpy, the most reliable storage option would be an external USB-3 or Thunderbolt drive that is dedicated to SecuritySpy, ideally formatted with HFS+ format AKA "Mac OS Extended (Journaled)".
