Object Storage for Dummies
You should consider using the OpenStack Object Storage service if you eventually plan on distributing your storage cluster across multiple data centers, if you need unified accounts for your users for both compute and object storage, or if you want to control your object storage with the OpenStack Dashboard. For more information, see the Swift project page.
What is Object Storage?
Block storage is implemented in OpenStack by the Block Storage service cinder. Because these volumes are persistent, they can be detached from one instance and re-attached to another instance and the data remains intact. The Block Storage service supports multiple back ends in the form of drivers. Your choice of a storage back end must be supported by a block storage driver.
However, support for utilizing files as volumes is also well established, with full support for NFS, GlusterFS and others. These drivers work a little differently than a traditional block storage driver.
Cloud Object Storage – Basics and Examples
In multi-tenant OpenStack cloud environment, the Shared File Systems service manila provides a set of services for management of shared file systems. The Shared File Systems service supports multiple back-ends in the form of drivers, and can be configured to provision shares from one or more back-ends.
The Shared File Systems service is persistent storage and can be mounted to any number of client machines. It can also be detached from one instance and attached to another instance without data loss. During this process the data are safe unless the Shared File Systems service itself is changed or removed. Users interact with the Shared File Systems service by mounting remote file systems on their instances with the following usage of those systems for file storing and exchange.
The Shared File Systems service provides shares which is a remote, mountable file system. You can mount a share and access a share from several hosts by several users at a time. With shares, you can also:.
Free eBook: Object Storage for Dummies
Create a share on either a share server or standalone, depending on the selected back-end mode, with or without using a share network. Combine several shares in groups to keep data consistency inside the groups for the following safe group operations. Create a snapshot of a selected share or a share group for storing the existing shares consistently or creating new shares from that snapshot in a consistent way. OpenStack storage explains the differences between Openstack storage types. Parameter in nova.
Admin establishing encrypted volume type , then user selecting encrypted volume.
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Depends completely on the size of back-end storage specified when a share was being created. In case of thin provisioning it can be partial space reservation for more details see Capabilities and Extra-Specs specification. Most users who have used a network storage solution before have encountered this form of networked storage. OpenStack clouds do not present file-level storage to end users. There are various commodity storage back end technologies available. Ceph utilises and object storage mechanism for data storage and exposes the data via different types of storage interfaces to the end user it supports interfaces for: - Object storage - Block storage - File-system interfaces.
Ceph provides support for the same Object Storage API as swift and can be used as a back end for the Block Storage service cinder as well as back-end storage for glance images. Ceph supports thin provisioning implemented using copy-on-write. This can be useful when booting from volume because a new volume can be provisioned very quickly.
Ceph also supports keystone-based authentication as of version 0. The administrator has more fine-grained control over data distribution and replication strategies. Support for the distributed file-system interface CephFS. You should consider Ceph if you want to manage your object and block storage within a single system, or if you want to support fast boot-from-volume.
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A distributed shared file system. As of Gluster version 3. GFO uses a customized version of swift that enables Gluster to be used as the back-end storage. The main reason to use GFO rather than swift is if you also want to support a distributed file system, either to support shared storage live migration or to provide it as a separate service to your end users. If you want to manage your object and file storage within a single system, you should consider GFO. The Logical Volume Manager LVM is a Linux-based system that provides an abstraction layer on top of physical disks to expose logical volumes to the operating system.
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