Concepts

• (Charm) Storage instances, attachments
• Volumes, volume attachments
• Filesystems, filesystem attachments
• Block devices
• Scope (environment, machine)
• Persistent/non-persistent
• Dynamic/static
• Shared/non-shared
• Life binding

Storage Providers

IaaS-integrated

Many compute services have integrated storage services. For example, AWS's EC2 and EBS; OpenStack's Nova and Cinder, etc. Below is a list of IaaS-specific storage providers available through Juju.

Microsoft Azure

Elastic Block Store (EBS)

Google Compute Engine (GCE)

Metal as a Service (MAAS)

OpenStack Cinder

Common filesystem providers

Volume-backed

Loop devices

Tmpfs

Writing a storage provider

Charm metadata

Workers

• Storage provisioner
• Machine provisioner
• Disk manager