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

13. The STABLE and EXCLUSIVE modes cannot be used in a mixed CSE
complex when any of the systems are at a release earlier than VM/ESA ®
Release 1.1.
14. Messages are given to the user if:
a. A WRITE link exists to the requested disk or
b. A READ link exists to the disk and you are linking with mode WR, M, MR,
or MW.
No messages are given if no other links exist, or a READ link exists, and you
are linking with mode R or RR.
15. LINK response #2 is issued when CP does the link. If you issue the LINK
command from CMS mode then no response is issued. If you issue LINK from
CP READ mode, response #2 is issued. Also, if you issue #CP LINK, from
either mode, response #2 is issued.
16. An informational response is not always generated after a read link is
established.
17. LINK is used to obtain access directly to another user’s minidisk, or to obtain
access indirectly, through linking to another user’s LINK or MDISK directory
statement (LINKS to LINKS). Up to 50 of these indirect links (LINK
indirections) are allowed. For example:
USER0
MDISK 393 3390 1 10 USRVOL ALL ALL ALL
USER1
LINK USER0 393 393 RR
USER2
LINK USER1 393 393 RR
USER3
LINK USER2 393 393 RR
Since USER1 has had to first access the 393 minidisk through a direct link to
USER0, USER2’s link to the 393 minidisk is considered an indirect link.
USER3’s link to the 393 minidisk through USER2 is thus also an indirect link.
Up to 50 of these indirect links are allowed before the following message is
issued:
HCP109E
userid vdev not linked; excessive LINK indirections
Note: This limit of 50 indirect links includes the original link. (In the example,
USER1 to USER0.)
18. State change interrupts will not be reflected to guests who dynamically link to
any full-pack minidisk. To receive state change interrupts for full-pack
minidisks, a static link should be defined in the user directory followed by the
DASDOPT statement specifying DEVCTL or SYSCTL level of control.
19. The link allowed by the LINK command to the vdev1 device belonging to
userid is summarized in the tables that follow.
Table 11. Linking to a Device in READ Mode
Link
Mode You
Entered
R No
Yes
Yes
Yes
READ Password
Specified in the
System Directory?
Any Other Links to this Device? Link Type You Will
Establish
Not applicable
No
Yes—READ, stable READ
Yes—WRITE, stable WRITE,
exclusive (READ or WRITE)
None
READ
READ
None
LINK
Chapter 2. CP Commands 513