| Upgrading to DRBD 8.4 |
| ===================== |
| |
| Linux kernel versions after 3.8 include DRBD 8.4, a new minor release with |
| significant changes both in configuration and operation. An overview of the |
| most important changes can be found at: |
| |
| http://www.drbd.org/users-guide-8.4/ap-recent-changes.html |
| |
| Configuration file changes |
| -------------------------- |
| |
| A number of changes in the configuration file format are present in 8.4. They |
| are outlined at: |
| |
| http://www.drbd.org/users-guide-8.4/s-recent-changes-config.html |
| |
| If you are upgrading from 8.3, please upgrade your configuration files to the |
| new format. Unfortunately, due to the way backwards compatility is provided |
| upstream, these options will not be understood by drbdadm if you boot a kernel |
| with DRBD 8.3 (kernel versions before 3.8), so you will have to revert your |
| changes if you want to use older kernels. |
| |
| Downgrading to DRBD 8.3 |
| ------------------------ |
| |
| A device that has been attached or created using DRBD 8.4 will not work |
| automatically under DRBD 8.3, due to changes in device metadata. In order to |
| make your devices work with DRBD 8.3, you will have to do the following |
| *before* booting the old kernel, to ensure that the metadata is clean: |
| |
| drbdadm down all |
| drbdadm apply-al all |
| |
| More information can be found at: |
| |
| http://www.drbd.org/users-guide-8.4/s-downgrading-drbd84.html |
| |
