Applying OS updates with RDQM

RDQM uses a DRBD kernel module which must be compatible with the current OS kernel level.

If OS updates are made which update the OS kernel level then a new DRBD kernel module might be required. See https://ibm.biz/mqrdqmkernelmods for guidance on compatibility between DRBD kernels and OS kernels.

Typically, a DRBD kernel update is required when the OS kernel branch is updated. For example, from RHEL 7.7 (3.10.0_1062) to RHEL 7.8 (3.10.0_1127).

In this case, follow the procedure Update DRBD kernel module before nodes are rebooted into a new kernel.

If we have already rebooted nodes into a new kernel, and find that RDQM does not run, follow the procedure Update DRBD kernel module after a node has rebooted into a new kernel.

• Update DRBD kernel module before nodes are rebooted into a new kernel
  If an OS update requires a DRBD kernel update, we should follow this procedure before you reboot the nodes into the new OS kernel.
• Update DRBD kernel module after a node has rebooted into a new kernel
  If a node was rebooted to a new OS kernel level and the DRBD kernel module is now incompatible with the current OS kernel level then RDQM might fail to start correctly on the node.

Parent topic: Installing RDQM (replicated data queue managers)