Data Exchange Volume Types; A/9A/La Volume Structure (Fxmto, Fxotm, Fxoto) - HP StorageWorks P9000 User Manual

The FCU program provides the commands and GUI for Data Exchange file transfer operations as well
as several important options for data exchange, including EBCDIC-ASCII code conversion and data
record padding and delimiters. The FAL is a library of C functions (Visual C++), which provides an
application programming interface for data exchange. The FAL functions can be called by user
application programs to read and write data in mainframe datasets on the storage systems. There
are two types of FAL, the 32-bit FAL and the 64-bit FAL. The latter is provided by storage systems.
The FMT and ALC utilities enable the open-system user to format OPEN-x logical units (LUs) and create
intermediate datasets for FXoto operations, without having to be attached to any mainframe hosts.
OPEN-x is defined as a standard LU type. The storage systems support OPEN-3, OPEN-8, OPEN-9,
OPEN-E, OPEN-L, and OPEN-V devices. Contact HP technical support for the latest information on
supported LU types.

Data Exchange Volume Types

The FXmto and FXotm volumes are mainframe devices that can only be accessed by open-system hosts
using the Data Exchange software. The FXoto volumes are open-system devices that cannot be accessed
by mainframe hosts. Data Exchange operations are performed using the following types of Data
Exchange volumes on storage systems:
• FXmto, FXotm. The Data Exchange -A volumes can be used for FXmto and FXotm operations.
Mainframe hosts have normal read/write access to -A volumes. Open-system hosts have read/write
access to -A volumes, but must use Data Exchange to access these volumes as raw devices (no
mount operation).
Figure 3 3390-3A/9A/LA Volume Structure (FXmto, FXotm, FXoto)
.
NOTE:
The -A volumes are not write-protected. Do not execute any open-system write operations to -A
volumes (except disk partitioning and labeling). Do not create a file system on an -A volume; this
will overwrite the data exchange files on the volume.
• FXmto. The Data Exchange -B volumes can only be used for FXmto operations. Mainframe hosts
have normal read/write access to -B volumes. Open-system hosts have read-only access to -B
volumes and must use Data Exchange to read these volumes as raw devices (no mount operation).
The -B volumes are write-protected from open-system access. The storage systems will reject all
open-system write operations to -B volumes (except disk partitioning and labeling) to protect the
mainframe data on these volumes.
Figure 4 on page 18 shows the structure of the Data Exchange -B volumes.
Figure 3 on page 17 shows the structure of the Data Exchange -A volumes.
HP StorageWorks P9000 Data Exchange User Guide 17