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Replacing failed hardware
It is essential to plan and know how to replace failed hardware in your cluster without compromising your cloud environment.
Consider the following to help establish a hardware replacement plan:
- What type of node am I replacing hardware on?
- Can the hardware replacement be done without the host going down? For example, a single disk in a RAID-10.
- If the host DOES have to be brought down for the hardware replacement, how should the resources on that host be handled?
If you have a Compute (nova) host that has a disk failure on a RAID-10, you can swap the failed disk without powering the host down. On the other hand, if the RAM has failed, you would have to power the host down. Having a plan in place for how you will manage these types of events is a vital part of maintaining your OpenStack environment.
For a Compute host, shut down instances on the host before it goes down. For a Block Storage (cinder) host using non-redundant storage, shut down any instances with volumes attached that require that mount point. Unmount the drive within your operating system and re-mount the drive once the Block Storage host is back online.