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

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ATTACH
Responses
32 z/VM: CP Commands and Utilities Reference
Duplexing is only allowed if both volumes are dedicated, or both are
DEVNO-defined full-pack minidisks. CP does not allow a guest virtual machine
to duplex a full-pack minidisk with a dedicated device.
13. The ATTACH command cannot be used to attach DEVNO-defined minidisks or
secondary volumes of duplex pairs to the system.
14. The ATTACH command cannot be used to attach virtual disks in storage.
15. The ATTACH command will verify that the correct allocation map is used by
the volume. Only FBA and devices with greater than 4K cylinders will use the
extent-based allocation map. All other DASD will use the cylinder-based
allocation map.
16. If a device is being throttled, you cannot attach it to the system as a CP-owned
device. To display whether a device is being throttled, use the QUERY
THROTTLE command (page 1030). To turn throttling off for a device, use the
SET THROTTLE command (page 1403).
17. An alias Parallel Access Volume DASD cannot be attached to the system. To
determine whether a device is an alias Parallel Access Volume, use the
QUERY PAV command (page 922) or the QUERY DASD DETAILS command
(page 766).
18. A base Parallel Access Volume DASD cannot be attached to the system if an
associated alias volume is currently attached to a guest. Similarly, an alias
Parallel Access Volume cannot be attached to a guest if its base volume is
currently attached to the system.
19. The MULTIUSER function is intended for guest operating systems that manage
their own assignment of tape devices. It is not intended for CMS unless some
external means of managing assignments or serializing access to the tape
device among the sharing users is explicitly implemented. Third party
assignment and multiple system assignment (Control Access CCW) are not
supported.
To share a tape device, a user must specify the MULTIUSER option when
attaching the device, or the CP directory entry for that user must contain a
DEDICATE statement for the device that includes the MULTIUSER operand. If
the first user to log on attaches the device without specifying MULTIUSER, or
has a DEDICATE statement for the device that does not include MULTIUSER,
the device becomes dedicated to that user. The device then cannot be
attached as MULTIUSER by any user until it is detached by the user to whom
it is dedicated.
The MULTIUSER function is valid only for 3480, 3490, and 3590 tape devices.
20. The USERACCessid option applies only to first-level and second-level users. If
it is attempted on a third-level or higher virtual machine, the request is
translated into corresponding first-level and second-level information only.
The receiver of the device attached, the user who issued the ATTACH command,
and the primary system operator all receive messages indicating that the ATTACH
was successful.
Note: The variable type is omitted from ATTACH responses when a range of
device numbers or multiple device numbers are being reflected in the
response. Control levels (for example, WITH xxxCTL) apply only to DASD;
R/O applies to DASD and tapes.
In ATTACH responses, type is one of the following: