external_cache
This table provides performance metrics and configuration characteristics for a given WAFL External Cache type, such as Flash Cache or the Predictive Cache Statistics simulator. High-level cache behavior can be monitored using these statistics.
Classic Object: ext_cache_obj
Table Row IDs
ID Format | Aggregation Type | Comment |
---|---|---|
{instance_name} |
(not applicable) |
This represents the construction of the row ID field, which is a single unique string that identifies a row. |
Properties
This section describes the mapping between classic (ONTAPI) string counter names and REST property names.
Classic String Counter | REST Property | Description |
---|---|---|
node_name |
node.name |
System node name |
Counters
This section describes the mapping between classic (ONTAPI) numeric counter names and REST counter names.
Classic Numeric Counter | REST Counter | Description |
---|---|---|
usage |
usage |
Percentage of blocks in external cache currently containing valid data |
accesses |
accesses |
External cache accesses per second |
disk_reads_replaced |
disk_reads_replaced |
Estimated number of disk reads per second replaced by cache |
hit |
hit.total |
Number of WAFL buffers served off the external cache |
hit_normal_lev0 |
hit.normal_level_zero |
Number of normal level 0 WAFL buffers served off the external cache |
hit_metadata_file |
hit.metadata_file |
Number of metadata file buffers served off the external cache |
hit_directory |
hit.directory |
Number of directory buffers served off the external cache |
hit_indirect |
hit.indirect |
Number of indirect file buffers served off the external cache |
miss |
miss.total |
External cache misses |
miss_normal_lev0 |
miss.normal_level_zero |
External cache misses accessing normal level 0 buffers |
miss_metadata_file |
miss.metadata_file |
External cache misses accessing metadata file buffers |
miss_directory |
miss.directory |
External cache misses accessing directory buffers |
miss_indirect |
miss.indirect |
External cache misses accessing indirect file buffers |
hit_percent |
hit.percent |
External cache hit rate |
inserts |
inserts |
Number of WAFL buffers inserted into the external cache |
evicts |
evicts |
Number of blocks evicted from the external cache to make room for new blocks |
invalidates |
invalidates |
Number of blocks invalidated in the external cache |
Property/Counter Content Changes
This section describes any output value differences between the classic (ONTAPI) string counter and the respective REST property. It also describes array label name changes between classic array counters and respective REST array counters.
Table Aliases
This section describes aliases for aggregated tables.