Exadata: Imbalance in Flashcache Usage Across Cells During Data Load Operations (Doc ID 2219228.1)

Last updated on MARCH 04, 2019

Applies to:

Symptoms

An imbalance in the cell flashcache usage is observed when running write-intensive workload. This is especially noticeable when there are multiple databases running in the environment, and the workload pattern is different across the databases.

Symptoms on the affected cell are:

• High HDD utilization
• High Flash Cache Partial Writes in the AWR reports (writes partially went to to the hard disks)

Note: Cell flashcache metrics can be collected using the following command:

# cellcli -e "list metrichistory where name like 'FC.*' and collectiontime > '2016-11-06T018:00:00-05:00' and collectiontime < '2016-11-07T03:00:00-05:00'" > metric_fc_`hostname`_1107.log

Cause