HP XP20000XP24000 Disk Array - Manual (Page 23)

About Cross-OS File Exchange Operations 2-5
Hitachi USP V Cross-OS File Exchange User’s Guide
Label area
Datasets
Management area
MAINFRAME OPEN SYSTEM
Read/Write
Read/Write
Read only
Read/Write
Cyl# 0
Cyl# max.
Cyl# 0
Cyl# MAX.
VTOC
Figure 2-4 3390-3B/9B/LB Volume Structure (FXmto)
Note: The open-system host accesses only the volume table of contents
(VTOC) area on -B volumes. Catalog or security control functions cannot be
used to provide access control for these volumes.
• FXotm. The FX -C volumes can only be used for FXotm operations. Open-
system hosts have read/write access to the -C volumes but must use
FAL/FCU to access these volumes as raw devices (no mount operation). z/OS
hosts have read-only access to the -C volumes. The TagmaStore subsystem
will reject all z/OS write operations to -C volumes (except VTOC) to protect
the open-system data on these volumes. Figure 2-5 shows the structure of
the FX -C volumes.
Label area
Datasets
Management area
MAINFRAME OPEN SYSTEM
Read/Write
Read/Write
Cyl# 0
Cyl# max.
Cyl# 0
Cyl# MAX.
VTOC
Read only
Figure 2-5 3390-3C/9C/LC, 3380-KC/3C Volume Structure (FXotm)
• FXoto. OPEN-x volumes that are formatted with the FX Formatter (FMT)
utility can only be used for FXoto operations. Open-system hosts have
read/write access to the OPEN-x FMT volumes but must use FAL/FCU to
access these volumes as raw devices (no mount operation). z/OS hosts do
not have any access to the OPEN-x FMT volumes. Figure 2-6 shows the
structure of the FX OPEN-x FMT volumes.