Release Notes

Dell PowerEdge R730xd Performance and Sizing Guide for Red Hat Ceph Storage - A Dell Red Hat Technical White Paper 12

Ceph cluster design considerations

Optimization

Criteria

Potential Attributes Example Uses

Capacity-

optimized

 Lowest cost per TB

 Lowest BTU per TB

 Lowest watt per TB

 Meets minimum fault domain

recommendation (single server is less than

or equal to 15% of the cluster)

 Typically object storage

 Erasure coding common for

maximizing usable capacity

 Object archive

 Video, audio, and image

object archive repositories

Throughput-

optimized

 Lowest cost per given unit of throughput

 Highest throughput

 Highest throughput per Watt

 Meets minimum fault domain

recommendation (single server is less than

or equal to 10% of the cluster)

 Block or object storage

 3x replication

 Active performance storage

for video, audio, and images

 Streaming media

2.1 Introduction to Ceph Storage Pools

For a Ceph client, the storage cluster is very simple. When a Ceph client reads or writes data (referred to as

an I/O context), it connects to a logical storage pool in the Ceph cluster. Figure 4 illustrates the overall

Ceph architecture, and concepts that are described in the sections that follow.

LIBRADOS

R ADOS

OSGW RBD

Ceph Storage Pools