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SANpath Device Information

Displays the current settings for the SANpath configuration.

NOTE: The SANpath settings cannot be modified if the version of SANpath is 3.0. For SANpath 3.1 or later, all parameters can be modified except the Exclude field.

Parameters

Buf
The number of buffer pointers (or buffer structures) preallocated for each logical device. For peak performance, Buf should be approximately equal to the maximum useful queue depth of the logical unit. Range: 1 - 100. Default: 32.

Retry Delay
The time interval, in milliseconds, between the retry attempts described in the Retry Count parameter. Default: 3000 ms. This value cannot be set above 100,000 ms (100s).

Failback
Indicates whether failback is enabled for the logical device. When failback is enabled (default: 1), SANpath continues testing a path that has failed and returns it to service (as the primary path or in load balancing) as soon as the path has been restored.

Primary path
Shows which of the physical I/O paths connecting the device to the host's HBAs (or controllers) is defined as primary (marked by an x). Initially, primary path asignments are distributed evenly among the available paths. This is an alternating pattern in a dual-path configuration. The device's duplicate paths are not used unless the primary path fails or the load balancing option is selected for that device.

Balance
Indicates whether dynamic load balancing is enabled for the device. When load balancing is enabled, SANpath tracks the volume of I/O on each path and automatically sends I/O requests to the path with the lightest I/O load. Automatic load balancing can be used with the SANnet storage systems only.

Retry Count
The number of times a failed I/O operation will be retried on the primary path after it has tried unsuccessfully to use its alternate path(s) and has returned again to the primary. When the specified number of retries has failed, the I/O fails. Default: 20. Highest Value Allowed: 1024.

Exclude
Indicates the device's exclusion setting, which can be used to keep a host from seeing particular logical drives. As a safety measure, SANpath excludes all devices from host access by default, giving them an exclusion setting of 1. Excluded devices are marked by an X in this column.

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