Dear dCache developers,

After upgrading from dCache 10.2.x to 11.2.3 at KIT, our XRootD door logs many WARN messages like:

Unsupported request: prepare[2048,0,[...]]

From the code and history (a501b3d), this appears intentional: dCache no longer replies OK to PrepareRequest because it does not actually stage or pin files via XRootD prepare. So the Unsupported response itself seems correct.

The problem is that many clients from CMS production activities appear to send prepare routinely, and this now creates large amounts of WARN log spam on the XRootD door.

Could this be improved by either:

1. downgrading this specific message to DEBUG, or
2. adding a configuration option to suppress these warnings for PrepareRequest?

Thanks,

Artur