HP StorageWorks Modular Smart Array 1000 HP Array Configuration Utility User G - Page 36
RebuildPriority, ExpandPriority, SurfaceScanDelay, SSPState, PreferredPathMode, Manual
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Read:write ratio RA4x00 with 16MB cache RA4x00 with 48MB cache All other controllers with battery-backed cache All other controllers without battery-backed cache 70:30 Y Y -- -- 60:40 Y Y -- -- 50:50 Y Y Y -- 40:60 -- Y -- -- 30:70 -- Y -- -- 25:75 -- Y Y -- 0:50* Y -- -- -- 0:75* -- Y -- -- 0:100 -- -- Y -- * The cache ratio percentages do not total 100 in these cases because the additional 16-MB or 48-MB cache modules are not used. Only the battery-backed write cache is used. RebuildPriority, ExpandPriority This option has three possible values: Low, Medium, and High. The default value for an unconfigured controller is Low. SurfaceScanDelay Enter a number between 1 and 30 to specify the duration of the surface scan delay in seconds. SSPState There are two settings for this option: Enable and Disable. If you do not specify a value for the SSP State, the existing setting remains unchanged. NOTE: The SSPState option is valid only for controllers that enable SSP on a controller basis, such as the MSA1000 or the Smart Array Cluster Storage controllers. RA4x00 controllers support SSP that is enabled on a logical drive basis, and use the LogicalDriveSSPState option ("LogicalDriveSSPState" on page 39) instead. If you enable SSP, you must also specify an adapter for one or more logical drives by using the SSPAdaptersWithAccess option ("SSPAdaptersWithAccess" on page 39). Otherwise, SSP is automatically disabled. PreferredPathMode The setting that you select for this option determines how the preferred I/O path to a particular logical drive is set for a redundant array controller that is in an active/active configuration. Not all controllers support this feature, and controllers in an active/standby configuration disregard this option. • Auto is the default setting for new configurations. In this case, the storage system automatically selects the I/O path from the redundant controller to the logical drive and dynamically load balances all paths. • Manual enables you to assign the logical drive to a specific redundant controller. If you select this setting, use the PreferredPath (on page 39) command to specify the path. If you are reconfiguring a controller and do not specify a setting for this option, the existing setting remains unchanged. Scripting in ACU 36
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