Documentation for the SnapMirror Business Continuity solution
Basic monitoring
There are several SM-BC components and operations you can monitor.
ONTAP mediator
During normal operation, the Mediator state should be connected. If it is in any other state, this might indicate an error condition. You can review the Event Management System (EMS) messages to determine the error and appropriate corrective actions.
| EMS Name | Description |
|---|---|
sm.mediator.added |
Mediator is added successfully |
sm.mediator.removed |
Mediator is removed successfully |
sm.mediator.unusable |
Mediator is unusable due to a corrupted Mediator server |
sm.mediator.misconfigured |
Mediator is repurposed or the Mediator package is no longer installed on the Mediator server |
sm.mediator.unreachable |
Mediator is unreachable |
sm.mediator.removed.force |
Mediator is removed from the cluster using the "force" option |
sm.mediator.cacert.expiring |
Mediator certificate authority (CA) certificate is due to expire in 30 days or less |
sm.mediator.serverc.expiring |
Mediator server certificate is due to expire in 30 days or less |
sm.mediator.clientc.expiring |
Mediator client certificate is due to expire in 30 days or less |
sm.mediator.cacert.expired |
Mediator certificate authority (CA) certificate has expired |
sm.mediator.serverc.expired |
Mediator server certificate has expired |
sm.mediator.clientc.expired |
Mediator client certificate has expired |
sm.mediator.in.quorum |
All the SM-BC records are resynchronized with Mediator |
Planned failover operations
You can monitor status and progress of a planned failover operation using the snapmirror failover show command. For example:
ClusterB::> snapmirror failover start -destination-path vs1:/cg/dcg1
Once the failover operation is complete, you can monitor the Synchronous SnapMirror protection status from the new destination cluster. For example:
ClusterA::> snapmirror show
You can also review the following messages to determine if there is an error and take the appropriate corrective actions.
| EMS Name | Description |
|---|---|
smbc.pfo.failed |
SMBC planned failover operation failed. Destination path: |
smbc.pfo.start. Destination path: |
SMBC planned failover operation started |
Automatic unplanned failover operations
During an unplanned automatic failover, you can monitor the status of the operation using the snapmirror failover show command. For example:
ClusterB::> snapmirror failover show -instance
Start Time: 9/23/2020 22:03:29
Source Path: vs1:/cg/scg3
Destination Path: vs3:/cg/dcg3
Failover Status: completed
Error Reason:
End Time: 9/23/2020 22:03:30
Primary Data Cluster: cluster-2
Last Progress Update: -
Failover Type: unplanned
Error Reason codes: -
You can also review the following messages to determine if there is an error and take the appropriate corrective actions.
| EMS Name | Description |
|---|---|
smbc.aufo.failed |
SnapMirror automatic planned failover operation failed. Destination path: |
smbc.aufo.start. Destination path: |
SMBC planned failover operation started |
smbc.aufo.completed: |
SnapMirror automatic planned failover operation completed. Destination path: |
smbc.aufo.failover.incapable |
block.giveback.during.aufo |
SM-BC availability
You can check the availability of the SM-BC relationship using a series of commands, either on the primary cluster, the secondary cluster, or both.
Commands you use include the snapmirror mediator show command on both the primary and secondary cluster to check the connection and quorum status, the snapmirror show command, and the volume show command. For example:
SMBC_A::*> snapmirror mediator show
Mediator Address Peer Cluster Connection Status Quorum Status
---------------- ---------------- ----------------- -------------
10.236.172.86 SMBC_B connected true
SMBC_B::*> snapmirror mediator show
Mediator Address Peer Cluster Connection Status Quorum Status
---------------- ---------------- ----------------- -------------
10.236.172.86 SMBC_A connected true
SMBC_B::*> snapmirror show -expand
Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
vs0:/cg/cg1 XDP vs1:/cg/cg1_dp Snapmirrored InSync - true -
vs0:vol1 XDP vs1:vol1_dp Snapmirrored InSync - true -
2 entries were displayed.
SMBC_A::*> volume show -fields is-smbc-master,smbc-consensus,is-smbc-failover-capable -volume vol1
vserver volume is-smbc-master is-smbc-failover-capable smbc-consensus
------- ------ -------------- ------------------------ --------------
vs0 vol1 true false Consensus
SMBC_B::*> volume show -fields is-smbc-master,smbc-consensus,is-smbc-failover-capable -volume vol1_dp
vserver volume is-smbc-master is-smbc-failover-capable smbc-consensus
------- ------- -------------- ------------------------ --------------
vs1 vol1_dp false true No-consensus
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