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

Examples
Responses
2. If you specify a list or range of devices, an attempt is made to vary the specified
path online or offline to each device. An error message is issued for every
device for which the specified path cannot be varied online or offline. Check
examples after these usage notes.
3. Paths leading to dedicated non-dynamic pathing devices that allow
RESERVE/RELEASE are not varied offline.
To determine if RESERVE/RELEASE is allowable, enter the QUERY DASD
command and see if the response from the device indicates that the device is
SHARED, RESERVED, or has a RESERVE PENDING (see the Responses
section of the QUERY DASD command).
4. Inoperational paths may be varied online because no I/O is issued to validate
the path when a non-dynamic pathing device is reserved or is dedicated to a
guest and supports RESERVE/RELEASE.
5. When varying a path offline:
v Vary the path offline from the guest operating system if the guest (such as
MVS/ESA) supports a VARY PATH command.
v Vary the path offline from the host system (z/VM).
6. When varying a path online:
v Make the path physically available.
v Vary the path online to the host (z/VM).
v Vary the path online to the guest operating system if the guest supports a
VARY PATH command.
7. If the IBM Service Representative indicates that the service on the path is
complete but the control unit initiated resume did not successfully vary the
affected path online, the FORCE option may be used to vary the quiesced path
back online.
Enter vary on path c2 to 140 to make path C2 leading to device 140 available to
that device. A typical response may appear as follows:
Vary path c2 online command initiated
Vary path c2 online command complete
Enter vary off path c2 from 0190-0197 to make path C2 unavailable to devices
0190 through 0197. A typical response may appear as follows:
Vary path c2 offline command initiated
Path c2 not varied offline from device 0192
because it is the last path to device
Vary path c2 offline command complete
Response 1: Vary Initiated:
VARY PATH yy {ONLINE } COMMAND INITIATED
{OFFLINE}
indicates that the request has been initiated.
yy is the path requested to be varied online or offline.
Response 2: Vary Complete:
VARY PATH yy {ONLINE } COMMAND COMPLETE
{OFFLINE}
VARY PATH
Chapter 2. CP Commands 1703