HP XP P9500 Storage - Manual (Page 18)

Figure 4 3390-3B/9B/LB Volume Structure (FXmto)
.
NOTE:
The open-system host accesses only the VTOC area on -B volumes. Catalog or security control
functions cannot be used to provide access control for these volumes.
• FXotm. The Data Exchange -C volumes can only be used for FXotm operations. Open-system hosts
have read/write access to the -C volumes, but must use Data Exchange to access these volumes
as raw devices (no mount operation). Mainframe hosts have read-only access to the -C volumes.
The storage systems will reject all mainframe write operations to -C volumes (except the VTOC) to
protect the open-system data on these volumes.
Figure 5 on page 18 shows the structure of the
Data Exchange -C volumes.
Figure 5 3390-3C/9C/LC, 3380-KC/3C Volume Structure (FXotm)
.
• FXoto. OPEN-x volumes that are formatted with the FMT utility can only be used for FXoto opera-
tions. Open-system hosts have read/write access to the OPEN-x FMT volumes, but must use Data
Exchange to access these volumes as raw devices (no mount operation). Mainframe hosts do not
have any access to the OPEN-x FMT volumes.
Figure 6 on page 19 shows the structure of the
Data Exchange OPEN-x FMT volumes.
About Data Exchange Operations 18