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N is "XXYY" number,
where
XX - SCSI ID (0..15)
YY - LUN (00..07)

Text String

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

Mapping	Description
"/dev/sd<L>"	Mapping to physical disk. "L" is letter here. Be careful not to destroy all the information from the disk dedicated to CHARON-AXP by mistak. These disks must not be formatted by the host OS. Example: set PKA container[0]="/dev/sdb" It is also possible to use not a whole disk, but previously created partitions on it. In this case the syntax is the following: "/dev/sd<L><N>" where N is the number of partition to be used.  Example: set PKA container[0]="/dev/sdc1"
"/dev/dm-<N>" "/dev/mapper/mpath<N>" "/dev/mapper/disk<N>"	Mapping to multipath disk.  Be careful not to destroy all the information from the disk dedicated to CHARON-AXP by mistake.   These disks must not be formatted by the host OS. Example: set PKA container[100]="/dev/dm-0"
"/dev/sg<N>"	Direct mapping to some SCSI device, for example, a SCSI disk or tape reader. Example: set PKA container[200]="/dev/sg0"
"/dev/sr<N>" "/dev/cdrom" "/dev/cdrom<N>	Mapping to CD-ROM device. Example: set PKA container[400]="/dev/sr0"
[<drive>":\"<path-name>”\”]<file-name>[“.iso”]	Mapping to an ISO file for reading distribution CD-ROM image.  Mapping may also include the full path (recommended), for example: "/my_disks/vms_distributive.iso" Example: set PKA container[600]="/my_disks/vms_distributive.iso"
[<drive>":\"<path-name>”\”]<file-name>[“.vdisk”]	Mapping to the file representing a physical disk of the HP Alpha system (disk image).  These files can be created from scratch with "mkdskcmd" utility. Data and OS disk backups are transferred from the original system via tapes or network and restored into these container files.   Mapping may also include the full path, for example: "/my_disks/my_boot_disk.vdisk"  Example: set PKA container[401]="my_dka401.vdisk"
[<drive>":\"<path-name>”\”]<file-name>“.vtape”	Mapping to the file representing the tape (tape image).  These files are created automatically.  Mapping may also include a full path (recommended), for example: "/my_tapes/backup.vtape" Example: set PKA container[500]="my_mka500.vtape"

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

media_type[N]

N is "XXYY" number,
where
XX - SCSI ID (0..15)
YY - LUN (00..07)

Text String

Instructs CHARON-AXP to use the supplied value as the PRODUCT field in the SCSI INQUIRY data returned to a software running on virtual HP Alpha system in response to SCSI INQUIRY command.

If not specified, CHARON-AXP attempts to guess the SCSI INQUIRY data based on virtual SCSI device type and underlying container (which is specified in the corresponding container configuration parameter).

Initially is not specified.

Example:

removable[N]

N is "XXYY" number,
where
XX - SCSI ID (0..15)
YY - LUN (00..07)

When set to "true", the removable configuration parameter instructs CHARON-AXP to report the corresponding virtual SCSI device as removable.

By default the removable configuration parameter is set to "false".

Example:

Note that virtual SCSI tapes and CD-ROM devices are always reported as removable regardless of the "removable" configuration parameter.

geometry [N]

N is "XXYY" number,
where
XX - SCSI ID (0..15)
YY - LUN (00..07)

Text String

This formatted string value specifies the explicit geometry of the disk storage element. This parameter is not applicable to tape storage elements.

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

If this parameter is not set, CHARON-AXP 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:

where:

Example:

use_io_file_buffering[N]

N is "XXYY" number,
where
XX - SCSI ID (0..15)
YY - LUN (00..07)

Boolean

When set to "true", instructs CHARON-AXP to enable host operating system I/O cache on reading/writing 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: