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RQDX3 Controller

The CHARON-VAX / CHARON-PDP QBUS system provides support for RQDX3 disk controllers. The original RQDX3 disk controller is capable of serving up to 4 disk units. CHARON-VAX / CHARON-PDP extends this limit so that the RQDX3 disk controller can be configured with up to 256 disk units. Normally all 256 disks can be connected to one MSCP disk controller, but if an application does intensive simultaneous I/O to more than 16 disks on one MSCP controller, it is recommended to configure additional RQDX3 controllers.

...

Example:

load RQDX3/RQDX3 DUA

The RQDX3 offers the following configuration parameters, which are specified with the "set" command:

address

Parameter

address

Type

Numeric

Value

Specifies the CSR address. This address must be a valid QBUS 22-bit address in IO space.

Initially its value is 017772150, which is the factory setting for the RQDX3 disk controller.

Use the "address" parameter for loading several instances of RQDX3. The "address" parameter value must be unique for every instance of the controller.

max_n_of_units

Parameter

max_n_of_units

Type

Numeric

Value

Specifies the maximum number of units supported by the controller. Possible values are 4…9999.

The default value is 9999.

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container

Parameter

container[N]

N=0…9999

Type Text String

Value

Specifies the location of the disk container. It can be either the name of a ".vdisk" file or the name of a physical disk:

Local fixed disks (IDE, SCSI, SATA)
- "\\.\PhysicalDrive<N>"
  "\\.\PhysicalDrive(DevID =XXX-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 DUA container[3]="\\.\PhysicalDrive(DevID= 6008-05F3-0005-2950-BF8E-0B86-A0C7-0001)"
  
  .The WWID values can be obtained from "Host Device Check" utility ("All drives" section), for example:Image Removed.
  
  Note
  If the "Host Device Check" utility does not display any WWID, this means the target disk does not have one. Use the "\\.\PhysicalDrive<N>" mapping in this case.
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 DUA container[0]="\\.\PhysicalDrive(iScsiTarget= iqn.2008-04:iscsi.charon-target-test1, LUN= 1)"
  
  .
Floppy drives
- "\\.\A:"
- "\\.\B:"
  .
CD-ROM, DVD drives (IDE, SCSI, …)
- "\\.\CdRom<N>"

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media_type

Parameter

media_type[N]

N=0…9999

Type

Text String

Value

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

Syntax:

"<device-name>[,<device-type>]"

where:

<device-name> is one of “DU”, “DK”, “SCSI”, “DI”, “DSSI”, “DJ”
<device-type> is of the form “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 “DU” and the device type is selected based on disk size.

Initially 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 a DSSI node id: N and an MSCP unit number: N. This parameter is not applicable to tape storage elements.

The string format is <X>”/”<Y>[“/”<Z>] where:

X is the number of sectors per track;
Y is the number of tracks per cylinder;
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 / CHARON-PDP will configure the geometry based on the most probable disk type.

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use_io_file_buffering

Parameter

use_io_file_buffering[N]

N=0…9999

Type

Text String

Value

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:

set DUA use_io_file_buffering[2]=true

...

In the above example the "rx23.vdisk" will be seen in VMS as DUA0, "\\.\PhysicalDrive1" as DUA1 and "\\.\CdRom0" as DUB5.

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Example 2:

load RQDX3/RQDX3 DIA address=017772150 max_n_of_units=4

set DIA container[0] = "C:\Charon\Disks\rx23.vdisk"
set DIA media_type[0] = "dssi"

set DIA container[1] = "\\.\PhysicalDrive1"
set DIA media_type[1] = "dssi"

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TQK50 and TUK50 Controllers

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Parameter

container[N]

N=0…9999

Type

Text String

Value

Specifies the location of the tape container. It can be either the name of a ".vtape" (".mtd") file or the name of a physical tape drive:

Tape images
- <file name>.vtape
  .
Local physical tape drives recognized by Windows
- "\\.\Tape<N>"
  .

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media_type

Parameter

media_type[N]

N=0…9999

Type

Text String

Value

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

Syntax:

"<device-name>[,<device-type>]"

where:

<device-name> is either: “MU”, “MK”, “SCSI”, “MI”, “DSSI”, or “MJ”
<device-type> is of the form “LLD” or “LLLD”, where “L” is letter a from A through Z, and “D” is a decimal number from 0 through 99

If not specified, the device name is set to “MU” and the device type is set to “TK50”

Initially not specified.

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load TQK50 MUA address=017774500

set MUA container[0] = "\\.\Tape0"
set MUA container[1] = "C:\Charon\Tapes\tape1.vtape"

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Multi-volume tape images are handled as follows:

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Parameter

xmi_node_id

Type

Numeric

Value

Specifies the XMI slot in which the virtual KDM70 storage controller is placed.

For CHARON-VAX/66X0 a free slot between 10 (A) and 14 (E) must be chosen.

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container

Parameter

container[N]

N=0…9999

Type

Text String

Value

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 PUA container[3]="\\.\PhysicalDrive(DevID= 6008-05F3-0005-2950-BF8E-0B86-A0C7-0001)"
  
  .The WWID values can be obtained from "Host Device Check" utility ("All drives" section), for example:Image Removed
  .
  
  Note
  If the "Host Device Check" utility does not display any WWID, this means the target disk does not have one. Use the "\\.\PhysicalDrive<N>" mapping in this case.
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 PUA container[0]="\\.\PhysicalDrive(iScsiTarget= iqn.2008-04:iscsi.charon-target-test1, LUN= 1)"
  
  .
Physical tape drives recognized by Windows
- "\\.\Tape<X>", where X is 0, 1, …
  .
Floppy drives
- "\\.\A:"
- "\\.\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"

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media_type

Parameter

media_type[N]

N=0…9999

Type

Text String

Value

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

Syntax:

"<device-name>,<device-type>"

where:

<device-name> is either: “DU”, “MU”, “DK”, “MK”, “SCSI”, “DI”, “MI”, “DSSI”, “DJ”, “MJ”
<device-type> is in the form: “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.

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Parameter

geometry[N]

N=0…9999

Type

Text String

Value

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:

X is the number of sectors per track
Y is the number of tracks per cylinder
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 described above is applicable only to disk storage elements. If the container is a tape image, the following format is used instead:

Syntax:

"<image-size>[, <early-warning-zone-size>]"

where:

<image-size> is the tape size in MB
<early-warning-zone-size> is the size (in KB) of the space left on the tape when a warning to the OS is issued. If omitted, 64K is assumed.

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use_io_file_buffering

Parameter

use_io_file_buffering[N]

N=0…9999

Type

Text String

Value

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:

set PUA use_io_file_buffering[0]=true

...

Parameter

vax_bi_node_id

Type

Numeric

Value

Specifies the VAXBI slot in which the virtual KDB50 storage controller is placed. For CHARON-VAX / CHARON-PDP a free slot between 1 (1) and 15 (F) must be chosen.

Initially set to 14.

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container

Parameter

container[N]

N=0…9999

Type

Text String

Value

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 PUA container[3]="\\.\PhysicalDrive(DevID= 6008-05F3-0005-2950-BF8E-0B86-A0C7-0001)"
  
  .The WWID values can be obtained from "Host Device Check" utility ("All drives" section), for example:Image Removed.
  
  Note
  If the "Host Device Check" utility does not display any WWID, this means the target disk does not have one. Use the "\\.\PhysicalDrive<N>" mapping in this case.
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 PUA container[0]="\\.\PhysicalDrive(iScsiTarget= iqn.2008-04:iscsi.charon-target-test1, LUN= 1)"
  
  .
Floppy drives
- "\\.\A:"
- "\\.\B:"
  .
CD-ROM drives (read-only)
- "\\.\CdRom<X>", where X is 0, 1, ...
  .
CHARON-VAX disk images
- [<drive>":\"<path-name>"\"]<file-name>[".vdisk"]

This parameter is initially not set, thus creating NO storage elements on the storage controller

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media_type

Parameter

media_type[N]

N=0…9999

Type

Text String

Value

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

Syntax:

"<device-name>,<device-type>"

where:

<device-name> is either: “DU”, “DK”, “SCSI”, “DI”, “DSSI” or “DJ”
<device-type> is in 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 “DU” and the device type is selected, based on the 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.

...

Parameter

geometry[N]

N=0…9999

Type

Text String

Value

This formatted string value specifies the explicit geometry of the disk storage element with MSCP unit number: N. This parameter is not applicable to tape storage elements.

The string format is <X>”/”<Y>[“/”<Z>] where:

X is the number of sectors per track
Y is the number of tracks per cylinder
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 / CHARON-PDP will configure the geometry based on the most probable disk type.

Initially not set.

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use_io_file_buffering

Parameter

use_io_file_buffering[N]

N=0…9999

Type

Text String

Value

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:

set PUA use_io_file_buffering[0]=true

...

Example:

Create a KDB50 MSCP controller in BI slot 1 of a VAX/PDP11:

...

Versions Compared

Old Version 8

New Version Current

Key

RQDX3 Controller

address

max_n_of_units

container

media_type

geometry

use_io_file_buffering

TQK50 and TUK50 Controllers

media_type

container

media_type

use_io_file_buffering

container

media_type

use_io_file_buffering

Page Comparison

Versions Compared

Old Version 8

New Version Current

Key

RQDX3 Controller

address

max_n_of_units

container

media_type

geometry

use_io_file_buffering

TQK50 and TUK50 Controllers

media_type

container

media_type

use_io_file_buffering

container

media_type

use_io_file_buffering