MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The diskstat table provides information about
writes to Disk Data tablespaces during the past 1 second.
The diskstat table contains the following
columns:
node_id
Node ID of this node
block_instance
ID of reporting instance of
PGMAN
pages_made_dirty
Number of pages made dirty during the past second
reads_issued
Reads issued during the past second
reads_completed
Reads completed during the past second
writes_issued
Writes issued during the past second
writes_completed
Writes completed during the past second
log_writes_issued
Number of times a page write has required a log write during the past second
log_writes_completed
Number of log writes completed during the last second
get_page_calls_issued
Number of get_page() calls issued during
the past second
get_page_reqs_issued
Number of times that a get_page() call
has resulted in a wait for I/O or completion of I/O already
begun during the past second
get_page_reqs_completed
Number of get_page() calls waiting for
I/O or I/O completion that have completed during the past
second
Each row in this table corresponds to an instance of
PGMAN; there is one such
instance per LDM thread plus an additional instance for each
data node.