macOS Content Caching not supported on SoftRAID?

I just took a Mac Pro 2019, Monterey, and enabled Content caching, pointing to a RAID 4 volume. Restarted, I had to activate it once more, but it appears to be working fine. theres a Library/Application Support folder to hold the cache data.

Tell me more about your setup.

I was trying to configure the content cache server to use a RAID 5 volume with five 10TB drives within a OWC Thunderbay 8 DAS connected via thunderbolt to a 2018 Mac Mini.  While I was able to enable content caching on the Mini internal SSD I could not get it to use the RAID 5 volume.  My workaround was to put a drive in an unused slot on the DAS and create a volume on that drive.  Once I did that I was able to configure content caching to use that new volume in the DAS.

@wfiveash 

Does this involve more than in "Sharing", enabling the content caching, and point it to the target volume?

that is what I did and it appeared to work fine, it started caching content immediately.

The issue may be related to the permissions I've given to my ThunderBay8 volume.  I've noticed that on the new volume which gives the staff group write permission content caching works.  Here are the permissions of the two volumes:

drwxrwxr-x 7 willf staff 306 Jan 29 14:12 Content Cache/
drwxr-x--- 29 willf staff 1054 Jan 29 14:27 ThunderBay8/

While I could do more experiments to see if this is the case, at this point I'm happy to have a separate volume for caching content.

@wfiveash 

You could also set "ignore permissions on this volume".

True but because I'm sharing the ThunderBay8 volume over the network I want permissions enforced on that volume.

@wfiveash 

You know how to use chown? I wonder if that would fix this also.

I'm very familiar with chown (and Unix CLI commands in general).  Given the ID I login to is "willf", that's the ID I want to own the root dir of the ThunderBay8 volume so I can manage the directory structure on that volume without having to use the "root" superuser ID.