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Every instance of KGPSA-CA works in one of the two following modes:
- Fabric virtualization mode 18401789411551 (creating virtual fabric in combination with virtual FC-3 Storage Controller). This is default mode.
- Pass Through mode 18401789411551 (using a specific CHARON PCI Pass Through driver)
- Fabric presentation mode 18401789411551 (using Linux FC HBA directly)
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Configuration parameters
The KGPSA-CA PCI FC adapter emulation has the following configuration parameters:
host_bus_location
| Parameter | host_bus_location |
|---|---|
| Type | Text String |
| Value |
Establish connection between virtual DEC-KGPSA-CA PCI FC adapter and physical EMULEX LightPulse PCI/PCI-X/PCIe FC adapter (Pass Through mode18401789411551) Syntax:
Example:
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wwid
| Parameter | wwid[N] N is 0..32766 (no more than 255 units) |
|---|---|
| Type | Text String |
| Value | Sets WWID for emulated KGPSA adapter unit. Syntax:
Example:
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container
| Parameter | container[N] N is 0..32766 (no more than 255 units) | ||
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| Type | Text String | ||
| Value | Possible values of the parameter are strings in one of the following forms:
This parameter is initially not set, thus creating NO storage elements on the controller. |
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media_type
| Parameter | media_type[N] N is 0..32766 (no more than 255 units) |
|---|---|
| Type | Text String |
| Value | Instructs CHARON-AXP to use the supplied value as the PRODUCT field in the FC INQUIRY data returned to a software running on virtual HP Alpha system in response to FC INQUIRY command. If not specified, CHARON-AXP attempts to guess the FC INQUIRY data based on virtual FC device type and underlying container (which is specified in the corresponding container configuration parameter). Initially is not specified. Example:
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removable
| Parameter | removable[N] N is 0..32766 (no more than 255 units) |
|---|---|
| Type | Boolean |
| Value | When set to "true", the removable configuration parameter instructs CHARON-AXP to report the corresponding virtual FC device as removable. By default the removable configuration parameter is set to "false". Example:
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geometry
| Parameter | geometry[N] N is 0..32766 (no more than 255 units) |
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| Type | Text String |
| Value | This formatted string value specifies the explicit geometry of the disk storage element. The string format is <X>”/”<Y>[“/”<Z>] or <X>”,”<Y>[“,”<Z>][“,”<B>] where:
If this parameter is not set, CHARON-AXP will configure the geometry based on the most probable disk type. Initially not set. Example:
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use_io_file_buffering
| Parameter | use_io_file_buffering[N] N is 0..32766 (no more than 255 units) |
|---|---|
| Type | Boolean |
| Value | When set to "true", instructs CHARON-AXP to enable host operating system I/O cache on read/write operations.
When enabled, host operating system I/O cache may significantly improve I/O performance of the virtual system. At the same time maintaining I/O cache requires additional host resources (CPU and memory) which may negatively affect overall performance of the virtual system. Initially is set to "false". Example:
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io_queue_depth
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See the "Configuration parameters18401789411551" section for details.
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The CHARON-AXP FC Fabric presentation mode allows to use Linux FC HBA directly. When using this mode, there is no need to load KGPSA adapter(s) as it was described before. The following syntax has to be used instead:
Example:
load kgpsa_generic_storage PGA interface="host3" |
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Name of FC, SCSI host or adapter's port/node name, defining a connection to Linux FC HBA, for example:
| Mapping | Description |
|---|---|
fc_host6 | Emulation over Linux SG (FC) host 6 |
host6 | Emulation over Linux SG (FC) host 6 |
2000-0000-C923-EA51 | Emulation over Linux SG (FC) host given with port/node name |
0x20000000C923EA51 | Emulation over Linux SG (FC) host given with port/node name |
wwn-0x20000000C923EA51 | Emulation over Linux SG (FC) host given with port/node name |
Example:
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The list of the LUNs to be excluded. If empty (default), nothing is excluded.
No multi line is possible for this parameter; the maximum number of symbols inside the double quotes is 255. Use "lun_include" parameter instead if a lot of LUNs must be excluded to specify only the included LUNs.
Example:
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lun_exclude parameter cannot exclude storage mapped to LUN 0 because of its special function. |
lun_include
The list of the LUNs to be included. If empty (default), all LUNs are included. No multi line is possible for this parameter; the maximum number of symbols inside the double quotes is 255. Use "lun_exclude" parameter instead if a lot of LUNs must be included to specify only the excluded LUNs.
Example:
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scsi_version
This approach of FC emulation downgrades all attached devices to the specifically defined version of SCSI. This is done to make legacy guest operating systems happy with attached modern devices.
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