The message log to monitor disabling I/O errors

The database server sends a message to the message log when a disabling I/O error occurs.

The message is:

Assert Failed: Chunk {chunk-number} is being taken OFFLINE.
Who: Description of user/session/thread running at the time
Result: State of the affected database server entity
Action: What action the database server administrator should take
See Also: DUMPDIR/af.uniqid containing more diagnostics

The result and action depend on the current setting of ONDBSPACEDOWN, as described in the following table.


ONDBSPACEDOWN setting	Result	Action
0	Dbspace {`space_name`} is disabled.	Restore dbspace {`space_name`}.
	Blobspace {`space_name`} is disabled.	Restore blobspace {`space_name`}.
1	The database server must stop.	Shut down and restart the database server.
2	The database server blocks at next checkpoint.	Use onmode -k to shut down, or use onmode -O to override.

The value of ONDBSPACEDOWN has no affect on temporary dbspaces. For temporary dbspaces, the database server continues processing regardless of the ONDBSPACEDOWN setting. If a temporary dbspace requires fixing, you can drop and recreate it.

For more information about interpreting messages that the database server sends to the message log, see the topics about message-log messages in the HCL OneDB™ Administrator's Reference.