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These parameters can be added to the "load" command or specified separately with the "set" command.
The example below shows how to configure a virtual CIXCD adapter with a location on the XMI bus other than the default. It declares a CIXCD adapter in slot 11 (0xB = decimal 11) of the virtual XMI bus:
load CIXCD PAA xmi_node_id=0xB |
The configuration file below creates a virtual VAX 6610 (single CPU) node with one virtual HSJ50 storage controller serving two disks to the VAX over a virtual CI network:
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HSJ50 storage controller
The virtual HSJ50 storage controller functionally replaces a physical HSJ50 CI storage unit. It supports virtual and physical disks, tapes and removable storage devices that are mapped on local or remote host platform storage. The virtual HSJ50 cannot connect to a physical CI infrastructure.
In a single CHARON-VAX/66X0 instance without a CI cluster, the virtual HSJ50 is located as a separate entity on the same host platform. In a CI cluster, the definition of each HSJ50 is replicated exactly in each CHARON-VAX CI CI node. In most cases one HSJ50 storage controller per virtual CI network is enough.
When loading an instance of a virtual HSJ50 storage controller, the CHARON-VAX configuration file must supply a unique reference name for that instance. While this name is only valid within the configuration file, it is recommended for clarity to use the VAX/VMS SCSNODENAME as an instance name.
The line below loads an emulated HSJ50 storage controller and assigns it the instance name SCSNOD:
load HSJ50 MYDISKS |
The HSJ50 emulation has the following configuration parameters:
ci_host
| Parameter | ci_host |
|---|---|
| Type | Text String |
| Value | A string value that specifies the instance name of the emulated CIXCD host adapter serving the virtual CI network. If this value is not set, CHARON-VAX will try to locate the host adapter automatically. Automatic lookup works only if the CHARON-VAX configuration has exactly one instance of an emulated CIXCD host adapter. |
ci_node_id
| Parameter | ci_node_id |
|---|---|
| Type | Numeric |
| Value | An integer value that specifies the address of an emulated HSJ50 storage controller on the virtual CI network. Possible values are from 0 through 127 (initially set to 0). |
scs_node_name
| Parameter | scs_node_name |
|---|---|
| Type | Text String |
| Value | A string value that specifies the SCSNODENAME of the emulated HSJ50 storage controller. The string is up to 6 characters long. Possible characters are uppercase letters A through Z, figures 0 through 9. Initially set to the name of the emulated HSJ50 controller. Therefore name of emulated HSJ50 controller must follow the above rules. |
scs_system_id
| Parameter | scs_system_id |
|---|---|
| Type | Numeric |
| Value | An integer value that specifies the SCSSYSTEMID of the emulated HSJ50 storage controller. Initially set to an arbitrary value that is guaranteed to be unique within the running emulated VAX 66x0 node. |
mscp_allocation_class
| Parameter | mscp_allocation_class |
|---|---|
| Type | Numeric |
| Value | An integer value that specifies the ALLOCLASS of the emulated HSJ50 storage controller. Possible values are from 0 through 255 (initially set to 0). |
container
| Parameter | container[N] N=0…9999 | ||
|---|---|---|---|
| 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 |
media_type
| Parameter | media_type[N] N=0…9999 | |
|---|---|---|
| Type | Text String | |
| Value | Overrides default (automatically determined) MSCP media type of the device. Syntax:
where:
If not specified, the device name is set to “DI” and the device type is selected based on disk size for disk storage elements. For tape storage elements, the device name and type are set to “MI” and “TF86” respectively. Initialy not specified. |
geometry
| Parameter | geometry[N] N=0…9999 | |
|---|---|---|
| Type | Text String | |
| Value | This formatted string value specifies the explicit geometry of the disk storage element with CI node id N and MSCP unit number N. This parameter is not applicable to tape storage elements. The string format is <X>”/”<Y>[“/”<Z>] where:
If this parameter is not set, CHARON-VAX will configure the geometry based on the most probable disk type. Initially not set. The syntax above is applicable only to disk storage elements. If the container is a tape image, the following format is used instead: Syntax:
where:
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use_io_file_buffering
| Parameter | use_io_file_buffering[N] N=0…9999 |
|---|---|
| Type | Boolean |
| Value | Enables use of host OS I/O buffering. Initially set to “false” (buffering disabled). |
The following example configures a virtual HSJ50 storage controller with a non-default CI network address of 11:
load HSJ50 DISKS ci_node_id=0x0B |
The configuration file below emulates a VAX 6610 node, one HSJ50 storage controller serving two disks:
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When this configuration file is executed and "container[0]" points to a valid VMS system disk image, a virtual VAX 6610 can boot VAX/VMS with the following command:
>>> BOOT /XMI:C /NODE:B DU0 |
In the above boot command, "/XMI:C" and "/NODE:B" instruct the boot ROM to connect to the disk via the host adapter in XMI slot C (the hex value C stands for decimal 12).
Then via the storage controller with CI node id B (decimal 11), DU0 is reached (defined as container[0]) and the boot command is executed for the associated file on the host system.
After logging into VMS, the “SHOW DEVICE” command displays the following:
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When a tape or disk image connected to an emulated HSJ50 controller is dismounted in VAX/VMS, it is disconnected from CHARON-VAX and can be manipulated. It may even be replaced with a different disk image if it keeps the same name. This capability may be useful when designing back-up and restore procedures.