Upgrading Open CAS Linux version

Open CAS Linux doesn’t support a smooth version upgrade. To perform an upgrade, all dirty data has to be flushed to core devices and all running cache instances have to be stopped. To perform both this actions at once, the following command can be used

# casctl stop –flush

To allow restoring an existing configuration after an upgrade, the /etc/opencas/opencas.conf file has to be preserved.

After preserving the config file and stopping all the running cache instances, the old version of Open CAS Linux must be removed.

Installing a new version of Open CAS Linux is covered in Installing CAS

After the new version of Open CAS Linux is installed, the old config can be restored using the preserved config file with

# casctl init –force