FX Volume Types

The FXmto and FXotm volumes are z/OS devices that can only be accessed by open-system hosts using the FAL/FCU software. The FXoto volumes are open- system devices that cannot be accessed by z/OS hosts. FX operations are performed using the following types of FX volumes on the TagmaStore USP and NSC subsystems:

FXmto, FXotm. The FX -A volumes can be used for FXmto and FXotm operations. z/OS hosts have normal read/write access to -A volumes. Open- system hosts have read/write access to -A volumes but must use FAL/FCU to access these volumes as raw devices (no mount operation). Figure 2-3shows the structure of the FX -A volumes.

MAINFRAME

Cyl# 0

Read/Write

Cyl# MAX.

Label area

VTOC

Datasets

Management area

OPEN SYSTEM

Cyl#0

Read/Write

Cyl# max.

Figure 2-3 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 FX -B volumes can only be used for FXmto operations. z/OS hosts have normal read/write access to -B volumes. Open-system hosts have read-only access to -B volumes and must use FAL/FCU to read these volumes as raw devices (no mount operation). The -B volumes are write-protected from open-system access. The TagmaStore subsystem will reject all open- system write operations to -B volumes (except disk partitioning and labeling) to protect the z/OS data on these volumes. Figure 2-4shows the structure of the FX -B volumes.

2-4

About Cross-OS File Exchange Operations

Hitachi USP V Cross-OS File Exchange User’s Guide

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Hitachi MK-96RD647-01 manual FX Volume Types, 3390-3A/9A/LA Volume Structure FXmto, FXotm FXoto