Manually flush SSD cache

This article describes the following topics

• Ceph pool has reach the full ratio at ~=60%, by default it will automatically flush the data into HDD pool.
• But, in some production case, the incoming data/IO and the process of flushing data are stacked togather; It will cause a loop at 60% flushing data and accepting incoming data.
• It will create a consistent IOPS for a long period, So we must manually flush the Data with command.

Connect to console

$ ssh [email protected]
Warning: Permanently added '192.168.1.x' (ECDSA) to the list of known hosts.
Password:

Flush SSD data to HDD pool: storage > cache > flush

Welcome to the Cube Appliance
Enter "help" for a list of available commands
controller> storage
controller:storage> cache
controller:cache> flush