DEVSERV command

Use the DEVSERV command to request a display of the status of DASD and tape devices. The response is a display of basic status information about a device, a group of devices, or storage control units, and optionally can include a broad range of additional information. You can display:
  • Device number
  • Device type
  • Logical mode of the device
  • Number of data sets allocated on the volume
  • Volume serial label
  • Channel path ID
  • Status of the path
  • Status of an SMS-managed device
    • Volume status
    • Storage group name
    • Storage group status
  • Control unit type and model
  • Control unit serial number
  • Device capacity, in cylinders
  • Device extended function status
  • Unit control block (UCB) device type information
  • Help text, when you request it
  • The following, if the device belongs to the DASD storage subsystem:
    • Real device type (if what is shown is an emulated device type)
    • Control unit type and model (or emulated control unit type and model if the real and emulated control units are not the same)
    • Subsystem ID for this storage subsystem
    • Cache fast write state
    • Track caching state
    • DASD fast write state
    • State of pinned data
    • State of dual copy, PPRC, or SPARing -- if there is any
    • Address of the other device in a dual copy pair
    • Channel subsystem device address
    • Subsystem internal logical device address
    • An indication if the device extended function status information is inconsistent between MVS™ control blocks and the storage subsystem
    • An indication if the defined (UCB) device type is inconsistent with the real device type
    • Optionally, the total number of cylinders for each unique track format (3380 and 3390) for all of the devices within the scope of the request
  • The following, if the device belongs to a tape library:
    • Device type equivalent to DTYPE from the DS P command
    • Device status indicating online / offline and ready / not ready
    • Device type and model
    • Device serial number
    • Library identification number
    • An indication if the defined (UCB) device type is inconsistent with the real device type
You can also use several options of the DEVSERV command:
Parent topic: MVS system commands reference