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Corrected a minor grammar for more logic plural usege in sentence. Change-Id: I8b4f0a40ee0825216e214ccee2c48d56e285d88d
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Replacing failed hardware
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It is essential to plan and know how to replace failed hardware in your cluster
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without compromising your cloud environment.
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Consider the following to help establish a hardware replacement plan:
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- What type of node am I replacing hardware on?
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- Can the hardware replacement be done without the host going down? For
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example, a single disk in a RAID-10.
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- If the host DOES have to be brought down for the hardware replacement, how
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should the resources on that host be handled?
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If you have a Compute (nova) host that has a disk failure on a
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RAID-10, you can swap the failed disk without powering the host down. On the
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other hand, if the RAM has failed, you would have to power the host down.
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Having a plan in place for how you will manage these types of events is a vital
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part of maintaining your OpenStack environment.
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For a Compute host, shut down instances on the host before
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it goes down. For a Block Storage (cinder) host using non-redundant storage,
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shut down any instances with volumes attached that require that mount point.
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Unmount the drive within your operating system and re-mount the drive once the
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Block Storage host is back online.
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