zpwr(1)

NAME
zpwr - Display power readings of a partition and central processor complex (CPC) on an IBM Z or LinuxONE server.

SYNOPSIS

zpwr
	[-d <NUMBER> | --delay=<NUMBER>] [-c <NUMBER> | --count=<NUMBER>]
	[--format=<STRING>]
	[-s | --stream]
	[-v | --version]
	[-h | --help]

DESCRIPTION

zpwr displays power readings of a partition and central processor complex (CPC) on an IBM Z or LinuxONE server.

Partition readings include CPU, storage and I/O power readings. It specifies the number of units allocated to the configuration at the time the reading was taken.

CPC readings include total, unassigned resources and infrastructure power readings.

Power reading units are automatically presented in a human readable format, whereas complex formats like json, csv, json-seq, pairs display the power readings in microwatts.

CPC power readings can be retrieved only when the required authorization was set for the LPAR. Enable the required authorization by setting "Global Performance Data" in LPAR's activation profile.

If the power readings cannot be retrieved, the power readings return an empty string or null in complex formats, and the power readings are not displayed in human readable format.

OPTIONS

--format=<STRING>
    Retrieve power readings in the following formats: json, csv, json-seq or pairs. If no format is specified in the command, the output will default to the human readable format.

    When the format is json, csv, json-seq or pairs, the power readings are displayed in microwatts.

-d, --delay
    Retrieve power readings after specified delay in seconds has elapsed.

-c <NUMBER>, --count=<NUMBER>
    Required number of power readings.

    The --count option can only be used in conjunction with --stream or --delay option.

-s, --stream
    Retrieve power readings in stream mode. A new power reading will be displayed only after an interval has elapsed since the last power reading request. The interval is automatically calculated in stream mode.

    The --stream and --delay options are mutually exclusive.

-v, --version
    Print version information.

-h, --help
    Print usage information.

OUTPUT
Iteration
    Iteration number of the current power readings. If the power reading is requested before the time interval has elapsed, cached power readings might be returned. The iteration number helps to determine if the cached power readings are provided.

Time
    The time at which power readings were taken, expressed in human readable format.

Time epoch
    The time at which power readings were taken, expressed in epoch time.

    sec
        The number of seconds elapsed since the Unix epoch.

    nsec
        The number of nanoseconds elapsed since the last full seconds.

Update interval
    Indicates the time interval in nanoseconds after which new power readings are available. If the power readings is requested before the time interval has elapsed, cached power readings might be returned.

CPU
    CPU power reading of a partition.

Storage
    Storage power reading of a partition.

I/O
    I/O power reading of a partition.

Total
    Specifies number of units for all electrical and mechanical components of the system.

Unassigned Resources
    Specifies number of units for all types of resources in the standby state or reserved state at the time the reading was taken.

Infrastructure
    Specifies number of units for all subsystems in the CPC which do not provide CPU, storage or I/O resources to partitions.

EXAMPLES
1. Display power readings in human readable format.
# zpwr
LPAR CPU:                       140.00  W
LPAR Storage:                     1.72  W
LPAR I/O:                        40.00  W
CPC Total:                       15.40 kW
CPC Unassigned Resources:         7.48 kW
CPC Infrastructure:               5.31 kW
Update interval: 10.00 s

2. Perform two power measurements with a delay of 10 seconds and output the data in json format.
# zpwr --format json --delay 10 --count 2
{
  "meta": {
    "api_level": "1",
    "version": "2.36.0-build-20250107",
    "host": "lpar001",
    "time_epoch": "1736316898",
    "time": "2025-01-08 07:14:58+0100"
  },
  "zpwr": [
    {
      "iteration": "0",
      "time": "2025-01-08 07:14:58+0100",
      "time_epoch_sec": "1736316898",
      "time_epoch_nsec": "10935887",
      "update_interval": "10000000000",
      "lpar": [
        "cpu": "140000000",
        "storage": "1719200",
        "io": "40000000"
      ],
      "cpc": [
        "total": "15406000000",
        "unassigned_resources": "7578848100",
        "infrastructure": "5283946300"
      ]
    },
    {
      "iteration": "1",
      "time": "2025-01-08 07:15:08+0100",
      "time_epoch_sec": "1736316908",
      "time_epoch_nsec": "11113153",
      "update_interval": "10000000000",
      "lpar": [
        "cpu": "140000000",
        "storage": "1719200",
        "io": "40000000"
      ],
      "cpc": [
        "total": "15401000000",
        "unassigned_resources": "7569928400",
        "infrastructure": "5284866000"
      ]
    }
  ]
}

3. Display power readings in csv format and in stream mode.
# zpwr --format csv --stream
"iteration","time","time_epoch_sec","time_epoch_nsec","update_interval","cpu","storage","io","total","unassigned_resources","infrastructure"
"0","2025-01-08 07:17:05+0100","1736317025","592784684","10000000000","143000000","1708200","40000000","15550000000","7659162700","5337186700"
"1","2025-01-08 07:17:15+0100","1736317035","592937261","10000000000","143000000","1708200","40000000","15533000000","7650389100","5328960300"