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| Parameter | io_queue_depth[N] N is 0..32766 (no more than 255 units) | |
|---|---|---|
| Type | Numeric | |
| Value | Specifies KGPSA I/O requests (read or write) for a given unit in a range 2..128 Setting this parameter enables KZPBA enables KGPSA instance to run up-to the specified numbers of I/O requests (read or write) for unit N in parallel, thus improving the performance. The default value set by controller is optimal for most of the cases. It may be needed to enlarge this number if guest OS I/O queue for a certain unit contains too much pending entries. In this case the value should be equal to an average size of the queue, collected statistically. Please do not set this parameter without clear understanding of the purpose. By default parallel execution of I/O requests is disabled. Example:
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min_n_of_threads
| Parameter | min_n_of_threads | |
|---|---|---|
| Type | Numeric | |
| Value | Instructs KGPSA I/O to reserve a given number of working threads in a range 1..64, thus improving the performance. All units of KGPSA instance share the I/O threads. The default value is equal to number of units plus 2. For optimization it is possible to set this parameter to sum of the "io_queue_depth" parameters for each unit plus 2. This assumption seems optimal for most of the cases. Please do not set this parameter without clear understanding the purpose. Example:
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| Command | Description | ||
|---|---|---|---|
| Scans connected SAN using FC adapters, discovers FC ports, storage controllers, logical units and then builds volatile FC database. The "/verbose" qualifier enables FC communication trace on console (for diagnostic and troubleshooting). | ||
| Displays corresponding part of volatile FC database. | ||
| Fills the environment variables wwid0..wwid3 and n1..n4 to identify path(s) to logical unit with the specified UDID. These variables are later used by "INIT" to create device database entries and by OpenVMS/Tru64 to get access to boot and dump disks. This command does NOT make any change to other environment variables. | ||
fc set {boot | dump} wwid <X> | Fills the environment variables wwid0..wwid3 and n1..n4 to identify path(s) to logical unit with the specified WWID. These variables are later used by "INIT" to create device database entries and by OpenVMS/Tru64 to get access to boot and dump disks. This command does NOT make any change to other environment variables. This parameter is useful if UDID is absent.
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| Clears environment variables wwid0...wwid3 and n1..n4, which automatically disable (but do NOT delete) device database entries representing FC attached devices. This command does NOT affect volatile FC database. |
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