We have upgraded our mail server (non-transaction logged) few month ago from Domino 9.0.1 FP8 to FP9 IF1 and since then we experienced occasional Domino task hang few times in a month.
Domino task such as Indexer and Replicator will hang on a certain mailbox and the mailbox is no longer accessible. Everything looks fine again after we restarted Domino. And when this appears again the next time, it will be a different mailbox.
We managed to run manual NSD when this happened and requested IBM Support to check on this.
It appears that this is a known issue in Domino 9.0.1 FP9 which happens on non transaction logged server and with warning quota set to DBs (mostly on mail server, as we set quota to mailboxes).
SPR #KBRNASPR6L - Domino server hangs in UBMDelayThreadDebug on non Transaction logging enabled servers.
Solution (Either one the following will prevent this):
1. Submit a PMR to IBM Support to obtain a custom hotfix. (this fix is not available in any of the public released interim fix for Domino 9.0.1 FP9.)
2. Enable transaction logging.
3. Upgrade to Domino 9.0.1 FP10 which includes this fix. (Not recommended for the moment, suggest to wait for Domino 9.0.1 FP10 IF1 which fixes problems in FP10)
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