z/VM: CP Commands and Utilities Reference - z/VM - IBM

Responses
5. FBA minidisks intended to be eligible for minidisk mapping and minidisk caching
must start and end on a 4K boundary and should be defined with a number of
blocks comprising a complete number of pages (a multiple of 8 blocks) because
partial pages will not be formatted by ICKDSF CPVOLUME.
6. If you define a minidisk as virtual device number 192, the following special rules
apply when you IPL CMS:
v If 192 is unformatted, CMS formats it and accesses it as file mode D.
v If 192 is CP-formatted, CMS reformats it for CMS use and accesses it as file
mode D.
v If 192 is CMS-formatted and accessed as a file mode other than D, CMS
reaccesses it as file mode D.
When CMS accesses a 192 minidisk as file mode D, any minidisk or SFS
directory already accessed as D is released.
7. For additional information, see “Usage Notes” on page 113.
Response 1:
DASD vdev DEFINED
confirms the definition of the DASD.
vdev
identifies the virtual device number of the minidisk you define.
DEFINE MDISK
Chapter 2. CP Commands 175