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

Responses
Table 13. Linking to a Device in Multiple WRITE Mode (continued)
Link
Mode You
Entered
MR No
Yes
Yes
Yes
MULT Password
Specified in the
System Directory?
Yes
MW No
Yes
Yes
Yes
Any Other Links to this Device? Link Type You Will
Establish
Not Applicable
No
Yes—READ
Yes—WRITE, stable (READ,
WRITE)
Yes—exclusive (READ, WRITE)
Not Applicable
No
Yes—READ, WRITE
Yes—stable (READ, WRITE),
exclusive (READ, WRITE)
None
WRITE
WRITE
READ
None
None
WRITE
WRITE
None
20. If the target minidisk is a virtual disk in storage that is defined in the specified
user’s directory entry but currently does not exist, the virtual disk in storage is
created to satisfy your request, as long as it does not exceed the system limit
on the storage available for virtual disks in storage. Note that a new virtual disk
in storage must be formatted before it can be used.
Attention: Do not format an existing virtual disk in storage that you have
linked to, or you will destroy all the data on it.
21. If you link a minidisk as virtual device number 192, the following special rules
apply when you IPL CMS:
v If 192 is an unformatted virtual disk in storage, CMS formats it and
accessed it as file mode D.
v If 192 is a CP-formatted virtual disk in storage, CMS reformats it for CMS
use and accesses it as file mode D.
v If 192 is a CMS-formatted virtual disk in storage or permanent minidisk that
is accessed as a file mode other than D, CMS reaccesses it as file mode D.
v If 192 is an unformatted or CP-formatted permanent minidisk, CMS does not
automatically format, reformat, access, or reaccess it.
When CMS accesses a 192 minidisk as file mode D, any minidisk or SFS
directory already accessed as D is released.
22. If the directory definition of a permanent minidisk is changed while users are
linked to it, existing links are unchanged, but any new links are made using the
new definition of the minidisk. Unpredictable results may occur.
23. If the directory definition of a virtual disk in storage is changed while users are
linked to it, existing links are unchanged, and any new links are made to the
existing virtual disk in storage. The existing virtual disk in storage is used until
the last user detaches it or logs off, at which time the virtual disk in storage is
destroyed. After that, any new links use the new definition of the virtual disk in
storage.
24. The CMS VMLINK command provides all the function of LINK and also allows
you to specify a nickname for userid vdev1, finds a free virtual device number
for vdev2, and also accesses the disk at a free mode letter. See the z/VM:
CMS Commands and Utilities Reference.
Response 1:
LINK
Chapter 2. CP Commands 515