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1 | Upgrading to DRBD 8.4 |
2 | ===================== | |
3 | ||
4 | Linux kernel versions after 3.8 include DRBD 8.4, a new minor release with | |
5 | significant changes both in configuration and operation. An overview of the | |
6 | most important changes can be found at: | |
7 | ||
8 | http://www.drbd.org/users-guide-8.4/ap-recent-changes.html | |
9 | ||
10 | Configuration file changes | |
11 | -------------------------- | |
12 | ||
13 | A number of changes in the configuration file format are present in 8.4. They | |
14 | are outlined at: | |
15 | ||
16 | http://www.drbd.org/users-guide-8.4/s-recent-changes-config.html | |
17 | ||
18 | If you are upgrading from 8.3, please upgrade your configuration files to the | |
19 | new format. Unfortunately, due to the way backwards compatility is provided | |
20 | upstream, these options will not be understood by drbdadm if you boot a kernel | |
21 | with DRBD 8.3 (kernel versions before 3.8), so you will have to revert your | |
22 | changes if you want to use older kernels. | |
23 | ||
24 | Downgrading to DRBD 8.3 | |
25 | ------------------------ | |
26 | ||
27 | A device that has been attached or created using DRBD 8.4 will not work | |
28 | automatically under DRBD 8.3, due to changes in device metadata. In order to | |
29 | make your devices work with DRBD 8.3, you will have to do the following | |
30 | *before* booting the old kernel, to ensure that the metadata is clean: | |
31 | ||
32 | drbdadm down all | |
33 | drbdadm apply-al all | |
34 | ||
35 | More information can be found at: | |
36 | ||
37 | http://www.drbd.org/users-guide-8.4/s-downgrading-drbd84.html | |
38 |