MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
The disk_write_speed_base table provides base
information about the speed of disk writes during LCP, backup,
and restore operations.
The disk_write_speed_base table contains the
following columns:
node_id
Node ID of this node
thr_no
Thread ID of this LDM thread
millis_ago
Milliseconds since this reporting period ended
millis_passed
Milliseconds elapsed in this reporting period
backup_lcp_bytes_written
Number of bytes written to disk by local checkpoints and backup processes during this period
redo_bytes_written
Number of bytes written to REDO log during this period
target_disk_write_speed
Actual speed of disk writes per LDM thread (base data)