Troubleshooting
The following sections provide troubleshooting and support information. This information
contains instructions for using several user interfaces to troubleshoot, recover, or maintain your
system.
Best practices for troubleshooting
Taking advantage of certain configuration options, and ensuring vital system access information has been recorded, makes the process of troubleshooting easier.
User interfaces for servicing your system
The system provides several user interfaces to troubleshoot, recover, or maintain your system. The interfaces provide various sets of facilities to help resolve situations that you might encounter.
Event reporting
Events that are detected are saved in an event log. As soon as an entry is made in this event log, the condition is analyzed. If any service activity is required, a notification is sent, if you set up notifications .
Resolving a problem
Described here are some procedures to help resolve fault conditions that might exist on your system. A basic understanding of the system concepts is required.
Recover system procedure
The recover system procedure recovers the entire storage system if the system state is lost from all control enclosure node canisters. The procedure re-creates the storage system by using saved configuration data and is also known as Tier 3 (T3) recovery. The saved configuration data is in the active quorum disk and the latest JSON configuration backup file. The recovery might not be able to restore all volume data.
Backing up and restoring the system configuration
You can back up and restore the configuration data for the system after preliminary tasks are completed.
Enabling concurrent maintenance
To enable concurrent maintenance, a system is configured as pairs of nodes. Each pair is called an I/O group. If one system node is shut down or disconnected for maintenance, the other node can keep the I/O group operational.
Removing a control enclosure and its expansion enclosures
You can use the management GUI and the command-line interface (CLI) to remove the control enclosure and all its attached expansion enclosures.
Deleting a node from a system by using the CLI
You can use the command line interface (CLI) to remove a node from a system.
Moving expansion enclosures
To move an expansion closure from one control enclosure to another, complete the following steps.
Shutting down a system by using the CLI
You can use the command-line interface (CLI) to shut down a system.