D-VPX-DY-A-24 Exam Dumps - Dell VPLEX Deploy Achievement

In a VPLEX Metro environment without a Cluster Witness, consistency groups (CGs) are used to manage distributed virtual volumes with detach rules that determine the behavior during a cluster failure.

CG1 with Cluster-1 as Winner: For App1, the distributed virtual volumes are added to CG1, which has a detach rule set with cluster-1 as the winner. This means that if cluster-2 fails, I/O for CG1 will continue to be serviced at cluster-1 after it automatically attaches the volumes that were distributed across both clusters1.

CG2 with Cluster-2 as Winner: For App2, the distributed virtual volumes are added to CG2, which has a detach rule set with cluster-2 as the winner. In the event of a cluster-2 failure, I/O for CG2 will be serviced after the volumes are detached from cluster-2, allowing cluster-1 to take over and service the I/O1.

Extended Cluster-2 Failure: If cluster-2 fails for an extended period, the VPLEX Metro will follow the detach rules set for each consistency group. CG1 will have its I/O serviced at cluster-1, and CG2 will also have its I/O serviced at cluster-1 after detaching from the failed cluster-21.

No Cluster Witness: Without a Cluster Witness, the VPLEX Metro relies on the detach rules defined in the consistency groups to determine how to handle I/O in the event of a cluster failure1.

Operational Continuity: The goal is to maintain operational continuity for both applications. By servicing I/O for both CG1 and CG2 at cluster-1, VPLEX ensures that both applications remain operational despite the failure of cluster-21.

In summary, if cluster-2 fails for an extended period in a VPLEX Metro setup without a Cluster Witness, I/O for CG1 will be serviced at cluster-1, and I/O for CG2 will also be serviced at cluster-1 after detaching from cluster-2, as per the detach rules set for each consistency group.

When VPLEX Metro is added to an existing HP OpenView network monitoring environment and only the remote VPLEX cluster is reporting performance statistics, the likely cause is a misconfiguration of the SNMP agent on the local VPLEX cluster management server.

SNMP Agent Configuration: The SNMP (Simple Network Management Protocol) agent on the VPLEX management server must be correctly configured to communicate with the HP OpenView monitoring system. If the local cluster’s SNMP agent is misconfigured, it may not report performance statistics correctly1.

Troubleshooting Steps: To resolve this issue, the following steps should be taken:

Verify the SNMP configuration on the local VPLEX cluster management server.

Check for any discrepancies in the SNMP version, community strings, and allowed hosts between the local and remote clusters.

Ensure that the SNMP service is running and properly configured to send traps and fetches to the HP OpenView system1.

Firewall and Network Checks: Although TCP Port 443 is important for secure communications, it is not typically used for SNMP, which usually operates over UDP ports 161 and 162. Therefore, a blockage of TCP Port 443 would not directly affect SNMP reporting1.

HP OpenView Compatibility: While HP OpenView running SNMP version 2C could potentially cause issues with performance statistic reporting, if the remote cluster is reporting correctly, it suggests that the version of SNMP is not the issue in this case1.

VPLEX Witness Configuration: The VPLEX Witness is not directly involved in the reporting of performance statistics to HP OpenView, so a misconfiguration of the VPLEX Witness’s SNMP agent would not cause this specific issue1.

In summary, the cause of the issue where only the remote VPLEX cluster is reporting performance statistics to HP OpenView is likely due to a misconfigured SNMP agent on the local VPLEX cluster management server.