4868e1c226
Based on sphinx spellchecker testing/refinement. Signed-off-by: Ron Stone <ronald.stone@windriver.com> Change-Id: Ibfe9b6d7bc8bf044a7fff0ac7e362e4067b17989
125 lines
6.6 KiB
ReStructuredText
Executable File
125 lines
6.6 KiB
ReStructuredText
Executable File
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.. uvy1462906813562
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.. _storage-resources:
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=================
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Storage Resources
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=================
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|prod-os| uses storage resources on the controller-labelled master hosts, the
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compute-labeled worker hosts, and on storage hosts if they are present.
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The storage configuration for |prod-os| is very flexible. The specific
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configuration depends on the type of system installed, and the requirements of
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the system.
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.. _storage-resources-section-N1005C-N10029-N10001:
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-----------------------------
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Storage Services and Backends
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-----------------------------
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The figure below shows the storage options and backends for |prod-os|.
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.. figure:: /shared/figures/storage/zpk1486667625575.png
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|prod-os| Storage Options and Backends
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Each service can use different storage backends.
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**Ceph**
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This provides storage managed by the internal Ceph cluster. Depending on
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the deployment configuration, the internal Ceph cluster is provided through
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|OSDs| on OpenStack master / controller hosts or storage hosts.
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.. _storage-resources-table-ajr-tlf-zbb:
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.. table:: Table 1. Available Backends for Storage Services
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:widths: auto
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+---------+---------------------------------------------------------------+---------------------------------------------------------------+
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| Service | Description | Available Backends |
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+=========+===============================================================+===============================================================+
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| Cinder | - persistent block storage | - Internal Ceph on master/controller hosts or storage hosts |
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| | | |
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| | - used for VM boot disk volumes | |
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| | | |
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| | - used as additional disk volumes for VMs booted from images| |
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| | | |
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| | - snapshots and persistent backups for volumes | |
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+---------+---------------------------------------------------------------+---------------------------------------------------------------+
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| Glance | - image file storage | - Internal Ceph on master/controller hosts or storage hosts |
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| | | |
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| | - used for VM boot disk images | |
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+---------+---------------------------------------------------------------+---------------------------------------------------------------+
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| Nova | - ephemeral object storage | - CoW-Image on Compute Nodes |
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| | | |
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| | - used for VM ephemeral disks | - Internal Ceph on master/controller hosts or storage hosts |
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+---------+---------------------------------------------------------------+---------------------------------------------------------------+
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.. _storage-resources-section-N10035-N10028-N10001:
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--------------------
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Uses of Disk Storage
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--------------------
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**Containerized OpenStack System**
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The |prod-os| system containers use a combination of local container
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ephemeral disk, |PVCs| backed by Ceph and a containerized HA mariadb
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deployment for configuration and database files.
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**VM Ephemeral Boot Disk Volumes \(that is, when booting from an image\)**
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Virtual machines use local ephemeral disk storage on computes for Nova
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ephemeral local boot disk volumes built from images. These virtual disk
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volumes are created when the |VM| instances are launched. These virtual
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volumes are destroyed when the |VM| instances are terminated.
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**VM Persistent Boot Disk Volumes \(that is, when booting from Cinder Volumes\)**
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Virtual machines can optionally use the Ceph-backed storage cluster for
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backing Cinder boot disk volumes. This provides permanent storage for the
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|VM| root disks, facilitating faster machine startup, but requiring more
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storage resources. For |VMs| booted from images it provides additional
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Cinder disk volumes for persistent storage.
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**VM Additional Disks**
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Virtual machines can optionally use local ephemeral disk storage on
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computes for additional virtual disks, such as swap disks. These disks are
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ephemeral; they are created when a |VM| instance is launched, and destroyed
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when the |VM| instance is terminated.
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**VM Block Storage backups**
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Cinder volumes can be backed up for long term storage in a separate Ceph
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pool.
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.. _storage-resources-section-N100B3-N10028-N10001:
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-----------------
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Storage Locations
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-----------------
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In additional to the storage used by |prod-os| system containers, the following
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storage locations may be used.
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**Controller Hosts**
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In the Standard with Controller Storage deployment option, one or more
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disks can be used on controller hosts to provide a small Ceph-based cluster
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for providing the storage backend for Cinder volumes, Cinder backups,
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Glance images, and remote Nova ephemeral volumes.
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**Compute Hosts**
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One or more disks can be used on compute hosts to provide local Nova
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ephemeral storage for virtual machines.
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**Combined Controller-Compute Hosts**
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One or more disks can be used on combined hosts in Simplex or Duplex
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systems to provide local Nova Ephemeral Storage for virtual machines and a
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small Ceph-backed storage cluster for backing Cinder, Glance, and Remote
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Nova Ephemeral storage.
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**Storage Hosts**
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One or more disks are used on storage hosts to provide a large scale
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Ceph-backed storage cluster for backing Cinder, Glance, and Remote Nova
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Ephemeral storage. Storage hosts are used only on |prod-os| with Dedicated
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Storage systems.
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