HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 305
Managing the Rebuild Process, Checking Rebuild Progress, Changing Rebuild Priority Settings
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Managing the Rebuild Process If a disk fails, the disk array automatically begins the rebuild process the first time an I/O is performed to the LUN, providing that there is a global hot spare available. If no global hot spare is available, the rebuild will not occur until the failed disk has been replaced. While a rebuild is in process, you can check its progress and change the rate at which the rebuild occurs. A rebuild must be in process to perform either of these tasks. Checking Rebuild Progress To check the progress of a rebuild, type: amdsp -r The progress of all rebuilds currently taking place on the disk array will be displayed. Changing Rebuild Priority Settings The rebuild process must compete with host I/Os for disk array resources. Two settings allow you to control whether the rebuild process or host I/Os will have greater access to these resources. These settings reflect how important the rebuild process is relative to I/O activity on the LUN being rebuilt. If you select settings that give higher priority to the rebuild process, it will complete sooner but at the cost of lower I/O performance. Lower priority settings give precedence to host I/Os, which may delay the completion of the rebuild. These settings are used only if host I/Os are occurring during the rebuild. To change the rebuild priority settings, type: amutil -R -f -a • freq identifies the rate at which the disk array attempts to execute rebuild commands. Specified in tenths of a second, this value can be set to 1 to 50, or 0.1 seconds to 5.0 seconds. A low setting increases the frequency at which rebuild commands are issued, giving higher priority to the rebuild, but reducing I/O performance. A high value reduces the rebuild command frequency, giving higher priority to host I/Os. The default value for this setting is 1, or 0.1 seconds. Managing the Disk Array Using Array Manager 60 305 Managing the Disk Array on HP-UX