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

QUERY DASDFW
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Query
Authorization
Purpose
Operands
DASDFW
Usage Notes
Responses
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rdev
rdev1-rdev2
Privilege Class: B
Use the QUERY DASDFW command to display the DASD fast write status of
devices attached to cache storage subsystems.
rdev
rdev1-rdev2
is the real device number, a list of real device numbers, or a range of real
device numbers of the devices being queried.
1. The QUERY DASDFW command is only valid for cache storage subsystems
that support the DASD fast write function. An error message is generated if the
specified subsystem does not support this function.
2. Caching for RAID (Redundant Array of Independent Disks) technology DASD
such as the Enterprise Storage Server (supported under VM in 3990 emulation
mode) is always active. It cannot be modified by the user.
3. This command may be issued to offline devices.
Response 1:
rdev DASD fast write function {is active. }
{is inactive. }
{destaging has failed.}
{is suspended. }
This response is repeated for each specified device when you enter the QUERY
DASDFW command.
rdev
is the real device number of a device being queried.
is active
indicates that the DASD fast write function is active for the device.
is inactive
indicates that the DASD fast write function is inactive for the device.
QUERY DASDFW
destaging has failed
indicates that deactivation of DASD fast write is pending because transfer of
modified data to DASD has failed.
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Chapter 2. CP Commands 775