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Ceph Cookbook - Second Edition by Karan Singh, Michael Hackett, Vikhyat Umrao

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How to do it...

To understand the need for these commands better, let's assume a scenario where you want to add a new node to your production Ceph cluster. One way is to simply add the new node with several disks to the Ceph cluster, and the cluster will start backfilling and shuffling the data on to the new node. This is fine for a test cluster.

However, the situation becomes very critical when it comes to a production setup, where you should use some of the ceph osd subcommands/flags, which are mentioned as follows, before adding a new node to the cluster, such as noin, nobackfill, and so on. This is done so that your cluster does not immediately start the backfilling process when the new node comes in. You can then unset these flags during ...

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