High disk latency after upgrade due to Flash Cache options being disabled
Applies to
- ONTAP 9.3 and later
- External cache options
Issue
- High latency is seen after an ONTAP upgrade from 9.3 to higher releases
- Disk utilization is at 100% but before was lower before upgrade
- Flash Cache options are off
Cluster1::> system node external-cache show Node enabled rewarm mbuf-inserts pcs-size hya-caching ---------- ------- ------ ------------ -------- ----------- node1 true false false 256 false