The disk usage percentage metric value on device Details tab in USM showing incorrect value.
<Please see attached file for image>
The problem indicates that data in S_QOS_SNAPSHOT table remain outdated or not updated correctly.
(*) S_QOS_SNAPSHOT holds the latest QOS data and USM reads the table to display disk usage percentage metric on the device Details tab.
(*) data_engine probe is responsible to update S_QOS_SNAPSHOT table.
Please confirm current value of "hub_bulk_size" in the <setup> section of data_engine.cfg
If "hub_bulk_size" value is higher value than the total number of rows in S_QOS_DATA table,
please reduce "hub_bulk_size" value.
This is a known issue described in the below doc. Please take a look at this.
hub_bulk_size parameter is set to a value larger than the total QoS objects in the S_QOS_DATA table,
S_QOS_SNAPSHOT will not update.
To correct this issue, set the
hub_bulk_size to a value less than the total number of rows in the S_QOS_DATA table.