Symptoms
Discovery Issues on Data Domain. Getting Timed our errors. These same Data Domain were discovered earlier. Bumping the timeout to 1200 only cleared the issue for some Dell Data Domain appliances.
Data Domain collector log showed these generic errors.
WARNING -- [2023-02-15 10:59:00 MST] -- PollingUnitPollingGroup::waitAtEndOfPollingCycle(): Polling group 300.EMC-DATA-DOMAIN-BOOST.EMC-DATA-DOMAIN-CIFS.EMC-DATA-DOMAIN-DISK.EMC-DATA-DOMAIN-ENV.EMC-DATA-DOMAIN-FS.GENERIC-INTERFACES.GENERIC-HOST-RESOURCES-PROCESSOR.GENERIC-HOST-RESOURCES-STORAGE.EMC-DATA-DOMAIN-MTREE.EMC-DATA-DOMAIN-NFS.EMC-DATA-DOMAIN-QUOTA.EMC-DATA-DOMAIN-REPLICATION.GENERIC-SYSUPTIME.EMC-DATA-DOMAIN-SYSTEM.EMC-DATA-DOMAIN-VTL is taking too long: Completed in 425081ms. Skipping next polling cycle. 174919ms until next polling, at timestamp: 1676484115000
WARNING -- [2023-02-15 11:01:56 MST] -- PollingUnitTable::closeSession(): Interrupted session on xxx-xxxxxx.xx.xx.org:161 : Time to live has expired.
Cause
Default maxBulkSize of 50 was causing discovery timed out errors.
Resolution
In the incident that generated this kb article, maxBulkSize reduction cleared the discovery issue.
Pick a maxBulkSize value say 15.