Dell PowerVault MD3200 CLI Guide - Page 91

6 Maintaining a Storage Array Maintenance covers a broad spectrum of activities. Its goal is to keep a storage array operational and available to all hosts. This chapter provides descriptions of command line interface (CLI) and script commands that you can use to perform storage array maintenance. The commands are organized into four sections: • Routine maintenance • Performance tuning • Troubleshooting and diagnostics • Recovery operations The organization is not a rigid approach, and you can use the commands as appropriate for your storage array. The commands listed in this chapter do not cover the entire array of commands you can use for maintenance. Other commands, particularly the set commands, can provide diagnostic or maintenance capabilities. Routine Maintenance Routine maintenance involves those tasks you might perform periodically to ensure that the storage array is running as well as possible or to detect conditions before they become problems. Running a Media Scan Media scan provides a method of detecting physical disk media errors before they are found during a normal read from or write to the physical disks. Any errors detected are reported to the Major Event Log (MEL). Media scan provides an early indication of a potential drive failure and reduces the possibility of encountering a media error during host operations. A media scan is performed as a background operation and scans all data and consistency information in defined user virtual disks. A media scan runs on all virtual disks in the storage array with the following conditions: • An Optimal status • No modification operations in progress Maintaining a Storage Array 91