Page Comparison

port[N]

N=0…7

An integer value that specifies the TCP/IP port number on which the emulated SHAC host adapter listens for connections from another emulated SHAC host adapter with DSSI node id: N.

Possible values are from 1024 through 32767.

Initially not set.

host[N]

N=0…7

Text String

A string value that specifies the TCP/IP hostname (and optionally the TCP/IP port number) to connect to another emulated SHAC host adapter with DSSI node id: N.

The syntax for the string is “host-name[:port-no]”, with possible values for port-no in the range of 1024 through 32767.

Initially not set.

scs_node_name[N]

N=0…7

A string value that specifies the SCSNODENAME of the emulated storage element. This string can contain up to 6 characters. Possible characters are uppercase letters A through Z and integers 0 through 9.

Initially set to an arbitrary value that is guaranteed to be unique within the running emulated VAX 4000 model 106, 108, 700 or 705 node.

scs_system_id[N]

N=0…7

Numeric

An integer value that specifies the SCSSYSTEMID of the emulated storage element.

Initially set to an arbitrary value that is guaranteed to be unique within the running emulated VAX 4000 model 106, 108, 700 or 705 node.

mscp_allocation_class[N]

N=0…7

An integer value that specifies the ALLOCLASS of the emulated storage element.

Possible values are from 0 through 255.

Initially set to 0 which means no allocation class assigned.

container[N]

N=0…7

A string value that specifies the container of the storage element with DSSI node id: N and MSCP unit number: N. This storage element might be either a (virtual) disk or tape. In VMS, running on an emulated VAX 4000 model 106 or 108 node, these storage elements appear as DSSI disks (DIAN:) or DSSI (TF86) tapes (MIAN:).

Possible values of the parameter are strings in one of the following forms:

• Physical disk drives

• • "\\.\PhysicalDrive<X>", where X is 0, 1, …

• • "\\.\PhysicalDrive(DevID =

• • XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX)"

• • 
    

    DevID addresses the target physical disk by its WWID

• • (hexadecimal 128-bit identifier assigned to the disk

• • drive by its manufacturer/originator).

    Example:

    Div class small set PAA container[2]=

• • "\\.\PhysicalDrive(DevID

• • = 6008-05F3-0005-2950-BF8E-0B86-A0C7-0001)

• • "

    .

• iSCSI disks
  • "\\.\PhysicalDrive(iScsiTarget = <iSCSI target>, LUN = <LUN number>)

• • "
    

    iScsiTarget addresses the disk by its iSCSI target name.

• • LUN specifies LUN on connected iSCSI disk. 

    Example:

    Div class small set PAA container[3]=

• • "\\.\PhysicalDrive(iScsiTarget

• • = iqn.2008-04:iscsi.charon-target-test1, LUN

• • = 1)

• • "

    .

• Physical tape drives recognized by Windows
  • "\\.\Tape<X>", where X is 0, 1, …
    

• • .
• Physical tape drives not recognized by Windows

  • "\\.\Scsi<X>:<Y>:<Z>:<N>"

    Use the utility "Host Device Check" to find the values of X,Y,Z and N
    

• • .

• Floppy drives
  • "\\.\A:" or
  • "\\.\B:"
    

• • .
• CD-ROM drives (read-only)
  • "\\.\CdRom<X>", where X is 0, 1, …
    .

• CHARON-VAX disk images
  • [<drive>":\"<path-

• • name>"\

• • "]<file-name>[

• • ".

• • vdisk"]
    .

• CHARON-VAX

• tape images

  • [<drive>":\"<path-

• • name>"\

• • "]<file-

• • name>".

• • vtape"
    .

This parameter is initially not set, thus creating NO storage elements on the bus with corresponding DSSI node id.

media_type[N]

N=0…7

Text String

Overrides default (automatically determined) MSCP media type of the device.

Syntax:

where:

• <device-name> is either: “DU”, “MU”, “DK”, “MK”, “SCSI”, “DI”, “MI”, “DSSI”, “DJ” or “MJ”

• <device-type> is the form of: “LLD” or “LLLD”, where “L” is a letter from A through Z, and “D” is a decimal number from 0 through 99

If not specified, the device name is set to “DI”, and the device type is selected based on disk size for the disk storage elements. For tape storage elements, the device name and type are set to “MI” and “TF86”, respectively.

Initially not specified.

geometry[N]

N=0…7

This formatted string value specifies the explicit geometry of the disk storage element with DSSI 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:

1. X is the number of sectors per track

2. Y is the number of tracks per cylinder

3. Z (optional) is the number of cylinders on the unit. If omitted, Z is calculated based on X, Y and the total number of sectors on the unit that reflects the size of the disk storage element

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:

Syntax:

where:

use_io_file_buffering[N]

N=0…7

Text String

Instructs CHARON-VAX to enable host operating system I/O cache on reading/writing operations.

The following values are possible:

• "true" or "write-back" - the "write back" caching mode is used

• "write-through" - the "write through" caching mode is used

• "false" - caching is switched off

 Note that this caching has a significant effect only in case of mapping to disk and tape containers, not physical drives.

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: