HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 204

Note - Reconstruction can take hours or days to complete, depending on the virtual disk RAID level and size, drive speed, utility priority, and other processes running on the storage system. You can stop reconstruction only by deleting the virtual disk. Isolating Data Path Faults When isolating data path faults, you must first isolate the fault to an internal data path or an external data path. This will help to target your troubleshooting efforts. Internal data paths include the following: ■ Controller to disk connectivity ■ Controller to controller connectivity ■ Controller ingress (incoming signals from drive enclosures) ■ Controller egress (outgoing signals to drive enclosures) External data paths consist of the connections between the storage system and data hosts. To troubleshoot a data path using SMU, do the following: ■ Identify the fault as an internal or external data path fault using the steps in "Determining Storage System Status and Verifying Faults" on page 197 ■ Gather details about the fault ■ Review event logs ■ Replace the faulty component Isolating Internal Data Path Faults A Physical Layer Interface (PHY) is an interface in a device used to connect to other devices. The term refers to the physical layer of the Open Systems Interconnect (OSI) basic reference model. The physical layer defines all of the electrical and physical specifications for a device. In a SAS architecture, each physical point-to-point connection is called a lane. Every lane has a PHY at either end. Lanes are sometimes referred to as physical links. Fault isolation firmware monitors hardware PHYs for problems. 204 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008