Chapter 9. Storage
9.1. Introduction to Storage
- Data Domain: A data domain holds the virtual hard disks and OVF files of all the virtual machines and templates in a data center, and cannot be shared across data centers. Data domains of multiple types (iSCSI, NFS, FC, POSIX, and Gluster) can be added to the same data center, provided they are all shared, rather than local, domains.
ImportantYou must have one host with the status of
Upand have attached a data domain to a data center before you can attach an ISO domain and an export domain.
- ISO Domain: ISO domains store ISO files (or logical CDs) used to install and boot operating systems and applications for the virtual machines, and can be shared across different data centers. An ISO domain removes the data center's need for physical media. ISO domains can only be NFS-based. Only one ISO domain can be added to a data center.
- Export Domain: Export domains are temporary storage repositories that are used to copy and move images between data centers and Red Hat Virtualization environments. Export domains can be used to backup virtual machines. An export domain can be moved between data centers, however, it can only be active in one data center at a time. Export domains can only be NFS-based. Only one export domain can be added to a data center.