The Namespace DAG Status page reports the health of database copies in a Database Availability Group. Three test results are displayed through this page:
- DAG Database Copy Status
- DAG Database Copy Queue Length
- DAG Database Replay Queue Length
The data shown is drawn from the Functionality Agent results. The XML node inspected is LogReplication, in:
LogFiles\<server>\FunctionalityAgentMessage.xml
The page itself can be opened directly on the ENow web server:
http://localhost:20080/MailscapeWeb/DAG/DAGDatabaseCopy.aspx?server=<SERVER>
Replace localhost with the web server's host name if you are browsing from elsewhere, and 20080 with your own port if it was changed during installation.
DAG Database Copy Status
The database copy status maps to a dashboard indicator as follows.
| Indicator | Database status |
|---|---|
| Green | healthy, mounted, seeding, seedingsource, suspended |
| Grey | initializing, resynchronizing, mounting, dismounting, disconnectedandhealthy, disconnectedandresynchronizing |
| Red | failed, servicedown, dismounted, failedandsuspended, singlepagerestore, or any status not recognised by the list above |
Content Index State
The Content Index State returned by the Functionality Agent is also folded into the status calculation, unless the database has been excluded from that consideration in the Admin Console.
| Indicator | ContentIndexState value |
|---|---|
| Green | Healthy |
| Yellow | Begins with Crawling or Unknown |
| Red | Begins with Failed |
The Content Index State result is merged with the database status result to produce the overall status for the copy.
Alerting
Alerts are generated for the following conditions:
- Critical — the database status is one of the red values above, or the status is unknown or otherwise not recognised.
- Critical — Content Index State is included in the calculation and its value begins with
Failed. - Warning — Content Index State is included and its value begins with
CrawlingorUnknown. If the overall status is already critical, a critical alert is sent instead.
Note that warning alerts relate to Content Index State only. The database copy status itself raises a critical alert or none.
Queue lengths
- DAG Database Copy Queue Length uses the
CopyQueueLengthXML attribute, compared against the threshold configured in the Admin Console. - DAG Database Replay Queue Length uses the
ReplayQueueLengthXML attribute, compared against the threshold configured in the Admin Console.
Because both are threshold-driven, confirm the values in force in your own console before treating a warning or error as unexpected.
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