GLOBAL_IO_WAIT_INFO
Returns the real-time statistics of I/O control on all nodes, as described in Table 1.
| Name | Type | Description |
|---|---|---|
| node_name | text | Node name. |
| device_name | text | Name of the data disk mounted to the node. |
| read_per_second | double precision | Number of read completions per second. |
| write_per_second | double precision | Number of write completions per second. |
| write_ratio | double precision | Ratio of the disk write I/Os to the total I/Os. |
| io_util | double precision | Percentage of the I/O time to the total CPU time per second. |
| total_io_util | integer | Level of the CPU time occupied by the last three I/Os. The value ranges from 0 to 6. |
| tick_count | integer | Interval for updating disk I/O information. The value is fixed to 1 second. The value is cleared each time before data is read. |
| io_wait_list_len | integer | Size of the I/O request thread wait queue. If the value is 0, no I/O is under control. |
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