Glossary; For More Information - HPE Apollo 4500 Reference Manual

Reference guide

Glossary

• Ceph—Open source software for a distributed object store with no single point of failure.
• Cold, warm, and hot storage—Temperature in data management refers to frequency and performance of data access in storage. Cold
storage is rarely accessed and can be stored on the slowest tier of storage. As the storage "heat" increases, the bandwidth over time, as well as
instantaneous (latency, IOPS) performance requirements increase.
• Controlled Replication Under Scalable Hashing (CRUSH)—CRUSH uses "rules" and placement groups to compute the location of objects
deterministically in a SUSE Enterprise Server cluster.
• Failure domain—Area of the solution impacted when a key device or service experiences failure.
• Federated storage—Collection of autonomous storage resources with centralized management that provides rules about how data is stored,
managed, and moved through the cluster. Multiple storage systems are combined and managed as a single storage cluster.
• Object storage—Storage model designed for massive scale implemented using a wide, flat namespace. Focuses on data objects instead of
file systems or disk blocks, and metadata is applied on a per-object basis to give the object context. Typically accessed by a REST API.
A subset of SDS.
• Placement Group (PG)—A mapping of objects onto OSDs; pools contain many PGs, and many PGs can map to one OSD.
• Pool—Logical, human-understandable partitions for storing objects. Pools set ownership/access to objects, the number of object replicas, the
number of placement groups, and the CRUSH rule set to use.
• A Reliable, Autonomic Distributed Object Store (RADOS)—This is the core set of SUSE Enterprise Server software that stores the
user's data.
• Representational State Transfer (REST)—Stateless, cacheable, layered client-server architecture with a uniform interface. In
SUSE Enterprise Server, REST APIs are architected on top of HTTP. If an API obeys REST principles, it is said to be "RESTful."
• Software-defined storage (SDS)—A model for managing storage independently of hardware. Also typically includes user policies and may
include advanced features like replication, deduplication, snapshots, and backup.
• Swift—object storage in the open source OpenStack project, used to build clusters of redundant, scalable, distributed object stores.

For more information

With increased density, efficiency, serviceability, and flexibility, the HPE Apollo 4000 Server family is the perfect solution for scale-out storage
needs. To learn more about storage dense servers visit: hpe.com/us/en/servers/hpc-apollo-4000.html.
SUSE Enterprise Storage is built on Ceph and has excellent documentation available at its website; this white paper has sourced it extensively.
The documentation master page starts here: SUSE Enterprise Storage Documentation.
Learn more at
h22168.www2.hpe.com/us/en/partners/suse/
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