[Back to the list of classes](km-reference.html)

# Storage Physical Disk

PATROL Class: **SKM_PHYSICALDISK** - Monitor Type: **MONITOR** - Monitor Category: **System**  
CDM Class: **BMC_DiskDrive**  


Monitors a specific physical disk.

## Attributes (Parameters)

| Name | PATROL Name | Units | Default Thresholds | Description |
| --- | --- | --- | --- | --- |
| Operation Rate | OperationRate | operations/s | None | Total number of operations per second. Type: Statistics - Spikes expected - Default graph |
| Present | Present | 0 = Missing 1 = Present |  ALARM if = 0 (Missing) | Indicates whether the device is present or not since the last collect. Type: Availability - Spikes expected |
| Read Byte Rate | ReadByteRate | MB/s | None | Bytes read per second from the physical disk since the last collect. Type: Statistics - Spikes expected |
| Read Operation Rate | ReadOperationRate | operations/s | None | Number of read operations per second. Type: Statistics - Spikes expected |
| Read Response Time | ReadResponseTime | ms |  WARN if ≥ 20 ms | Average response time for read operations. Type: Response Time - Spikes expected |
| Response Time | ResponseTime | ms |  WARN if ≥ 20 ms | Average response time for all operations. Type: Response Time - Spikes expected |
| Status | Status | 0 = OK 1 = Degraded 2 = Failed |  WARN if = 1 (Degraded)  ALARM if = 2 (Failed) | The current status of the disk. Type: Availability - Spikes expected |
| Status Information | StatusInformation | None | None | Detailed information about the disk status. Type: Text |
| Transfer Byte Rate | TransferByteRate | MB/s | None | Total bytes transferred per second (sent and received). Type: Statistics - Spikes expected - Default graph |
| Write Byte Rate | WriteByteRate | MB/s | None | Bytes written per second to the physical disk since the last collect. Type: Statistics - Spikes expected |
| Write Operation Rate | WriteOperationRate | operations/s | None | Number of write operations per second. Type: Statistics - Spikes expected |
| Write Response Time | WriteResponseTime | ms |  WARN if ≥ 20 ms | Average response time for write operations. Type: Response Time - Spikes expected |