Troubleshooting
Troubleshooting procedures help you diagnose problems.
- 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. - Battery operation for Storwize V3500 Gen1 control enclosures
Each Storwize® V3500 node canister in the control enclosure caches critical data and holds state information in volatile memory. - Understanding the medium errors and bad blocks
A storage system returns a medium error response to a host when it is unable to successfully read a block. The Storwize V3500 response to a host read follows this behavior. - Resolving insufficient memory with a distributed array
If the creation of a distributed array fails due to a lack of memory, complete the following procedure to resolve the insufficient memory. - RAID write response time
This feature means that the RAID machine code layer, where redundancy exists to do so, can prevent drive bad behavior from having an unlimited impact on I/O performance. In addition, the system tries to avoid immediately committing to an array rebuild due to a brief offline event from a single drive, while there is full redundancy. - Storwize V3500 user interfaces for servicing your system
The Storwize V3500 provides a number of user interfaces to troubleshoot, recover, or maintain your system. The interfaces provide various sets of facilities to help resolve situations that you might encounter. - Starting statistics collection
The system collects statistics over an interval and creates files that can be viewed. - 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 have set up notifications. - Debugging and performance-monitoring statistics for offloaded data transfer
Offloaded data transfer (ODX) infrastructure captures debug and monitoring information for specific ODX modules and makes it available in global and local views. - Resolving a problem
Described here are some procedures to help resolve fault conditions that might exist on your system and which assume a basic understanding of the Storwize V3500 system concepts. - Procedure: SAN problem determination
You can solve problems with the Storwize V3500 system and its connection to the storage area network (SAN) with the optional Fibre Channel host interface adapter. - Resolving a problem with SSL certificates
If you are unable to connect to the management GUI from your web browser and received a Certificate expired or similar error, this information might help you resolve the issue. - Resolving a problem with SSL/TLS clients
Changing the security level of the system might cause the web interface, CIM clients, and other SSL/TLS clients to stop working. If any clients stop working, complete the following procedure. - Resolving a problem with offloaded data transfer
When Microsoft offloaded data transfer (ODX) is enabled on a system, it is possible to encounter problems. These procedures help you address some common issues that might arise. - Resolving a problem with Microsoft Windows disk manager
Microsoft Windows disk manager might hang if the host attempts to write to a LUN that is a remote copy secondary volume on a Storwize V3500 system. This procedure addresses this issue. - Fibre Channel link failures
You might need to solve problems on the Storwize V3500 system and its connection to the storage area network (SAN) when an optional Fibre Channel host interface adapter is being used.When a failure occurs on a single Fibre Channel link, the small form-factor pluggable (SFP) transceiver might need to be replaced. - Ethernet link failures
To assist in solving problems with the Ethernet ports that connect the Storwize V3500 system to one or more Ethernet networks, use this procedure. - Debugging iSCSI backend sessions
Complete the steps in the following procedures to debug iSCSI backend sessions. - Ethernet iSCSI host-link problems
If you are having problems attaching to the Ethernet hosts, your problem might be related to the network, the Storwize V3500 system, or the host. - 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. The saved configuration data is in the active quorum disk and the latest XML configuration backup file. The recovery might not be able to restore all volume data. This procedure is also known as Tier 3 (T3) recovery. - Backing up and restoring the system configuration
You can back up and restore the configuration data for the system after preliminary tasks are completed. - Servicing storage systems
Storage systems that are supported for attachment to the Storwize V3500 system are designed with redundant components and access paths to enable concurrent maintenance. Hosts have continuous access to their data during component failure and replacement. - Replacing parts
You can remove and replace customer-replaceable units (CRUs) in the control enclosure.