1601840 : Issue in accessing files from pnfs¶

Created: 2026-05-19T08:15:16Z - current status: new¶

Anonymized Summary¶

Issue: User unable to access certain files under /pnfs/desy.de/[EXPERIMENT]/tier2/store/user/[USERNAME]/....

Observations: 1. Direct access via network mount (/pnfs/...) fails. 2. Copy attempts via scp also fail. 3. Other files in the same /pnfs/desy.de/[EXPERIMENT] namespace are accessible. 4. Access via xrdcp (XRootD protocol) succeeds.

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Possible Cause & Solution¶

The issue likely stems from read-only mounting limitations of dCache at DESY. As documented (source): - /pnfs/desy.de/ paths are read-only when accessed via network mounts. - Writes/modifications require experiment-specific Grid frameworks (not direct shell commands like scp).

Next Steps: 1. Use XRootD (xrdcp) for reliable access, as confirmed working. 2. Consult [EXPERIMENT] administrators for approved write methods (if needed). 3. Avoid scp or direct edits—these are unsupported due to dCache’s object-store-like behavior.

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References: - dCache Filesystem Documentation