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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
- nbuf
- 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 preceding 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 will keep testing a
path that has failed and return 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 path(s) 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. Load balancing is not recommended for use with
Dot Hill's Fibre Box, and this field should remain at its default value
of 0 (disabled) for those systems. Automatic load balancing can
be used with the SANnet storage systems and with the RAID Turbo.
- 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: 100.
- 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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