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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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