Mastering Proxmox - Third Edition

Solid State Drive for Ceph Journal

Incoming data for the Ceph cluster gets written to a journal before it gets passed down to the OSDs themselves. So, a dedicated drive such as SSD will increase write speed greatly, since it can achieve an extreme write speed, much faster than a standard SATA or SAS drive. Even the fastest 15,000 rpm enterprise-grade disk drive does not come close to the performance of SSD. When selecting SSD for a Ceph journal, care must be taken in brand or model selection.

Not all SSDs will perform well for a Ceph journal. Currently, the only SSD that can withstand the rigorous load of Ceph while providing great write speed and power loss protection is the Intel DC S3700 or S3500. There are other SSDs that can also perform ...