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

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Disk

Performance and economics for the Ceph clusters both depend heavily on an effective choice of storage media. You should understand your workload and possible performance requirements before selecting the storage media for your Ceph cluster. Ceph uses storage media in two ways: the OSD journal part and the OSD data part. As explained in earlier chapters, every write operation in Ceph is currently a two-step process. When an OSD receives a request to write an object, it first writes that object to the journal part of the OSDs in the acting set, and sends a write acknowledgment to the clients. Soon after, the journal data is synced to the data partition. It's worth knowing that replication is also an important factor during write performances. ...

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