Steps to collect data on object I/O statistics using the DataStax Enterprise
Performance Service.
The following object I/O level diagnostic tables collect data on object I/O
statistics:
- object_io
Per node recent latency metrics by keyspace and table.
- object_read_io_snapshot
Per node recent latency metrics, broken down by
keyspace and table and orders data by mean read latency.
- object_write_io_snapshot
Per node recent latency metrics, broken down by
keyspace and table and orders data mean write latency.
Procedure
To enable the collection of this data:
-
Edit the file.
The location of
the
dse.yaml file depends
on the type of installation:
| Installer-Services |
/etc/dse/dse.yaml |
| Package installations |
/etc/dse/dse.yaml |
| Installer-No Services |
install_location/resources/dse/conf/dse.yaml |
| Tarball installations |
install_location/resources/dse/conf/dse.yaml |
-
In the dse.yaml file, set the enabled option for
resource_level_latency_tracking_options to
true.
# Data Resource latency tracking settings
resource_level_latency_tracking_options:
enabled: true
refresh_rate_ms: 10000
-
(Optional) To control how often the statistics are refreshed, increase or
decrease the
refresh_rate_ms parameter.
The refresh_rate_ms specifies the length of the sampling
period, that is, the frequency with which this data is updated.
