This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Jeff, At or before Sep 27 06:38:45 UTC, someone or something deleted the semaphore-set that's used by the upstream LDM database module to manage concurrent access to the database -- causing all subsequent upstream LDM processes to terminate prematurely in failure. By design, the database is deleted by the top-level LDM server upon normal termination or by the "ldmadmin start" command if and only if the LDM system isn't already running. I looked at the LDM user's crontab(1) entries superficially but didn't see anything that would do this. I restarted the LDM at Sep 27 19:44:52. At or before Sep 27 20:02:34 UTC someone or something again deleted the semaphore-set. Upstream LDM processes created after the deletion will again terminate in failure. What the devil is happening on ldm.michiganwxsystem.net that's deleting semaphore-sets? Regards, Steve Emmerson Ticket Details =================== Ticket ID: XGQ-958194 Department: Support LDM Priority: Normal Status: Closed