HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 211

Resetting a Host Channel on an FC or SAS Storage System Making a configuration or cabling change on a host might cause the storage system to stop accepting I/O requests from that host. For example, this problem can occur after moving host cables from one HBA to another on the host. To fix such a problem you might need to reset controller host ports (channels). For a Fibre Channel host port configured to use FC-AL (loop) topology, a reset issues a loop initialization primitive (LIP). For a SAS host port, a reset issues a COMINIT/COMRESET sequence. To reset a host port, as an Advanced Manage user: 1. Select Manage > Utilities > Host Utilities > Reset Host Channel. 2. Select the controller and host port. 3. Click Reset Host Channel. Changing PHY Fault Isolation Settings PHY lanes are the physical signal paths used for communication between the SAS expander in each controller module and the drive modules in a system. The Expander Controller in each controller module automatically monitors PHY error (fault) rates and isolates (disables) PHYs that experience too many errors. The Expander Isolation page is similar to the Expander Status page, but enables you to reset expander error counters, manually disable or enable individual PHYs, and disable or enable PHY fault isolation. Use of the Expander Status page is described in "Checking PHY Status" on page 206 and in "Expander Status" on page 167. Resetting Expander Error Counters If PHYs have errors, you can reset expander error counters and then observe error activity during normal operation. If a PHY continues to accumulate errors you can disable it in the Expander Controller Phy Detail panel. To reset expander error counters: ● In the Clear Expander Errors panel, click Clear Errors. Chapter 7 Troubleshooting Using SMU 211