6.10 FBA DASD De
vices

6.10.1 Function

This device statement is used to define a FBA DASD device to the Hercules configuration. The argument
specifies the name of a file which contains the FBA DASD image or the INET address of a Hercules
shared device server.

The file consists of fixed length 512-byte records each of which represents one physical block of the emu-
lated disk. To allow access to a minidisk within a full-pack FBA DASD image file two additional arguments
(origin and numblks) may be specified after the filename.

6.10.2 Syntax

Descriptive

filename [origin ] [numblks] [
sf shadowfile


or

ipname [ ] [
] n]

Diagram







Êʬ¬¬ r ¬¬¬ ¬¬¬ filename ¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬Ê







origin

ʬ¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬ÊÍ


numblks shadowfile ¬¬


or







~¬¬¬ ¬¬¬®

Êʬ¬¬ ¬¬¬ ¬¬¬ ipname ¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬Ê







ʬ¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ



n

6.10.3 Parameter

devaddr

This is the device address.

devtype

This is the device type. Valid device types are 3310, 3370, 9332, 9335, 9336, 0671.

filename

This specifies the filename (and path) of the file containing the DASD image.

origin

Specifies the relative block number within the DASD image file at which the mini-
disk begins. The number must be less than the number of blocks in the file. The
default origin is zero.

numblks

Specifies the number of 512-byte blocks in the minidisk. This number must not
exceed the number of blocks in the file minus the origin. If omitted or specified as
an asterisk (“*”), then the minidisk continues to the end of the DASD image file.

SF=

Specifies a shadow file for the DASD device. Please refer to the following CKD
DASD section for information regarding the use of the SF=shadow file option.

shadowfile

This is the base name of the shadow file. The handling of shadow files for FBA
devices is identical as that for CKD devices. Please refer to the following CKD
DASD section for information regarding the use of the SF=shadow filefile option.

SYNCIO

SYNCIO enables possible synchronous I/O and is explained in detail in the fol-
lowing CKD DASD section.

ipname

This is the host name or IP address of the system, where the Hercules shared
device server is running.

port

This is the port number the shared device server is listening on. If the port is omit-
ted then the default is 3990.

devnum

Devnum specifies the device number on the shared device server. If the device
number is omitted then the default is the current device number on the local
system.

COMP=n

This keyword requests that the data has to be transferred compressed between the
client and the server. The argument n specifies the compression level (1-9). Values
closer to 1 mean less compression but also less processor time to perform the
compression. Values closer to 9 mean the data is compressed more but also more
processor time is required to compress the data.

6.10.4 Examples

Example 1:

Define a 3310 FBA DASD device on device address 0120. The name and path of the file containing the
DASD image is "D:/DASD/TST001.FBA".

0120 3310 D:/DASD/TST001.FBA

Example 2:

Define a 3370 FBA DASD device on device address 0120. The DASD device is attached to a shared
device server which is running on a machine with IP address 192.168.200.1 and listening on port 3990.
The device address of the DASD on the shared device server is 0121.

0120 3370 192.168.200.1:3990:0121

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