Standard deviation in number of bytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds 

• std_dev_redo_speed_last_10sec 

Standard deviation in number of bytes written to REDO log per second, averaged over the last 10 seconds 

• backup_lcp_speed_last_60sec 

Number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds 

• redo_speed_last_60sec 

Number of bytes written to REDO log per second, averaged over the last 10 seconds 

• std_dev_backup_lcp_speed_last_60sec 

Standard deviation in number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds 

• std_dev_redo_speed_last_60sec 

Standard deviation in number of bytes written to REDO log per second, averaged over the last 60 seconds 

• slowdowns_due_to_io_lag 

Number of seconds since last node start that disk writes were slowed due to REDO log I/O lag 

• slowdowns_due_to_high_cpu 

Number of seconds since last node start that disk writes were slowed due to high CPU usage 

• disk_write_speed_set_to_min 

Number of seconds since last node start that disk write speed was set to minimum 

• current_target_disk_write_speed 

Actual speed of disk writes per LDM thread (aggregated) 

## 23.5.14.26 The ndbinfo disk_write_speed_aggregate_node Table 

The disk_write_speed_aggregate_node  table provides aggregated information per node about the speed of disk writes during LCP, backup, and restore operations. 

The disk_write_speed_aggregate_node  table contains the following columns: 

• node_id 

Node ID of this node 

• backup_lcp_speed_last_sec 

Number of bytes written to disk by backup and LCP processes in the last second 

