Glossary

This glossary offers a list of terms and definitions to define a vocabulary for Cinder concepts.

Logical Volume Manager (LVM)

Provides a method of allocating space on mass-storage devices that is more flexible than conventional partitioning schemes.

iSCSI Qualified Name (IQN)

IQN is the format most commonly used for iSCSI names, which uniquely identify nodes in an iSCSI network. All IQNs follow the pattern iqn.yyyy-mm.domain:identifier, where yyyy-mm is the year and month in which the domain was registered, domain is the reversed domain name of the issuing organization, and identifier is an optional string which makes each IQN under the same domain unique.

For example: iqn.2015-10.org.openstack.408ae959bce1

NVMe Qualified Name (NQN)

NQN is the format most commonly used for NVMe names, which uniquely identify hosts or NVM subsystems in a network. NQNs can follow one of two supported formats.

The first format, used by organizations that own a domain, is nqn.yyyy-mm.domain:identifier, where yyyy-mm is the year and month in which the domain was registered, domain is the reversed domain name of the issuing organization, and identifier is an optional string which makes each NQN unique under the same domain name.

For example: nqn.2014-08.com.example:nvme:nvm-subsystem-sn-d78432

The second format is used to create unique identifiers when there is not a naming authority or there is not a requirement for a human interpretable string. This format is nqn.2014-08.org.nvmexpress:uuid:identifier, where only the identifier is variable and consists of a 128-bit UUID based on the definition in RFC 4122 represented as a string.

For example: nqn.2014-08.org.nvmexpress:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6