HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS V3.1.x/4.1.x Reference Guide - Page 596

Fabric OS Commands portRegTest Bit write/read test of the ASIC SRAMs and registers. Synopsis: V3.1.x portRegTest Synopsis: V4.1.x portRegTest [--slot number][-ports itemlist] [-skiptests mask][-verbose mode] Availability Admin Release V3.1.x and V4.1.x Description Use this command to verify that SRAM and register data bits in each ASIC can be independently written and read. The method used is to write a walking pattern to each location. The command writes 0x00000001 to register N, then reads the data, and compares it to make sure that the same pattern previously written is read back. Then the command shifts the pattern leftward by 1 bit (to 0x00000002), repeats the write, read and compare cycle. This continues until the last writable bit in register N is reached (0x80000000 for a 32-bit register). For example, a 6-bit register is effectively tested with the following pattern for V3.1.x: 1. 0x0001 2. 0x0002 3. 0x0004 4. 0x0008 5. 0x0010 596 Fabric OS Version 3.1.x/4.1.x Reference Guide