uPerf is an open-source alternative to the DELL DPACK performance monitoring utility. Format: uPerf <log file name> [<interval in milisecs, 10 - 600000, default: 1000>] Run the program without arguments to find available disk counters. Copy/paste them into the configuration file. Configuration file format: \PhysicalDisk(<Instance>)\<Counter> Example: \PhysicalDisk(0 C: D:)\Disk Reads/sec By default, the following counters are monitored: \PhysicalDisk(0 C:)\Disk Reads/sec \PhysicalDisk(0 C:)\Disk Writes/sec \PhysicalDisk(0 C:)\Disk Read Bytes/sec \PhysicalDisk(0 C:)\Disk Write Bytes/sec \PhysicalDisk(0 C:)\Avg. Disk Bytes/Read \PhysicalDisk(0 C:)\Avg. Disk Bytes/Write \PhysicalDisk(0 C:)\Avg. Disk sec/Write \PhysicalDisk(0 C:)\Avg. Disk sec/Read \PhysicalDisk(0 C:)\Avg. Disk Read Queue Length \PhysicalDisk(0 C:)\Avg. Disk Write Queue Length