HP StorageWorks 4/64 HP StorageWorks Fabric OS 5.2.x administrator guide (5697 - Page 281
Troubleshooting, Most common problem areas, Table 57 Common troubleshooting problems and tools
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15 Troubleshooting This chapter provides information on troubleshooting and the most common procedures used to diagnose and recover from problems. It also includes specific troubleshooting scenarios as examples. Troubleshooting should begin at the center of the SAN - the fabric. Because switches are located between the hosts and storage devices and have visibility into both sides of the storage network, starting with them can help narrow the search path. After eliminating the possibility of a fault within the fabric, see if the problem is on the storage side or the host side, and continue a more detailed diagnosis from there. Using this approach can quickly pinpoint and isolate problems. For example, if a host cannot detect a storage device, run a switch command (such as switchShow) to find out if the storage device is logically connected to the switch. If not, focus first on the switch directly connecting to storage. Use your vendor-supplied storage diagnostic tools to better understand why it is not visible to the switch. If the storage can be detected by the switch, and the host still cannot detect the storage device, then there is still a problem between the host and switch. Most common problem areas Refer to Table 57 for a list of the most common problem areas that arise within SANs and a list of tools that can be used to resolve them. Table 57 Common troubleshooting problems and tools Problem Area Investigate Tools Fabric Storage Devices • Missing devices • Marginal links (unstable connections) • Incorrect zoning configurations • Incorrect switch configurations • Physical issues between switch and devices • Incorrect storage software configurations • Switch LEDs • Switch commands (for example, switchShow or nsAllShow) for diagnostics • Web or GUI-based monitoring and management software tools • Device LEDs • Storage diagnostic tools • Switch commands (for example, switchShow or nsAllShow) for diagnostics Hosts • Downlevel HBA firmware • Use the latest HBA firmware • Incorrect device driver installation recommended by the switch • Incorrect device driver configuration supplier or on the HBA supplier's web site • Host operating system diagnostic tools • Device driver diagnostic tools • Switch commands (for example, switchShow or nsAllShow) for diagnostics Storage Management Applications Incorrect installation and configuration of the storage devices that the software references. For example, if using a volume-management application, check for: • Incorrect volume installation • Incorrect volume configuration Application-specific tools and resources Fabric OS 5.2.x administrator guide 281
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