Jump to: navigation, search

Difference between revisions of "Cinder/MultiVolumeBackend"

m (Text replace - "__NOTOC__" to "")
(Deleting the content on the page, it's been moved to another location)
 
Line 1: Line 1:
 
+
This page has moved to [[Cinder-multi-backend]]
* '''Launchpad Entry''': https://blueprints.launchpad.net/cinder/+spec/multi-volume-backends
 
* '''Created''': 8 Aug 2012
 
* '''Contributors''': Nirmal Ranganathan
 
 
 
== Summary ==
 
 
 
Allow managing multi volume backends from a single volume manager. Right now there's a 1-1 mapping of manager-driver. This blueprint aims to provide suport for 1-n manager-drivers, where by certain volume drivers that really don't depend on local host storage can take advantage of this to manager multi backends without having to run multi volume managers.
 
 
 
The thought is to use the existing configuration sections to distinguish the various drivers to load for a single volume manager.
 
 
 
== Release Note ==
 
# Run one or more drivers with a single volume manager.
 
# Adds support for volume backends within the volumes table to distinguish which driver to choose for a certain volume.
 
 
 
== Rationale ==
 
 
 
Currently there's no way to manage multi backends, it's 1-1. This provides more flexibility for an operator manager several backends, where they could just run 2 or 3 volume managers for load balancing instead of having to run multi instances of volume managers for each of the backends plus if they need to load balance it.
 
 
 
== User stories ==
 
 
 
No user facing impact.
 
 
 
== Design ==
 
 
 
Provide a way in the configuration to support multiple sections per volume driver configuration.
 
 
 
== Implementation ==
 
 
 
=== Sample Config ===
 
 
 
Here's how the configuration would look like with the new changes.
 
NOTE: You can still run the regular 1-1 manager-driver with the existing configuration options.
 
 
 
 
 
<pre><nowiki>
 
[DEFAULT]
 
iscsi_helper=tgtadm
 
 
 
# Multi Volume Backend support
 
multi_backend_support=True
 
multi_backend_configs=locallvm,cluster1
 
 
 
[locallvm]
 
volume_driver=nova.volume.driver.ISCSIDriver
 
volume_group=cinder-volumes
 
 
 
[cluster1]
 
volume_driver=nova.volume.san.HpSanISCSIDriver
 
san_ip=x.x.x.x
 
san_ssh_port=123
 
san_login=foo
 
san_password=bar
 
san_clustername=cluster1
 
</nowiki></pre>
 
 
 
 
 
=== Code Changes ===
 
 
 
Mostly update the volume manager to support multi drivers and update the drivers to load configuration on startup rather than loading then when they need it.
 
 
 
=== Migration ===
 
 
 
==== Additions: ====
 
# volume_backends
 
## created_at  - datetime
 
## updated_at - datetime
 
## deleted_at - datetime
 
## deleted - tinyint(1)
 
## id - int(11)
 
## name - varchar(255)
 
## description - varchar(255)
 
 
 
==== Modifications: ====
 
# volumes
 
## backend_id - int(11) Foreign key to volume_backends.id
 
 
 
== Test/Demo Plan ==
 
 
 
TBD
 
 
 
----
 
[[Category:Spec]]
 

Latest revision as of 20:33, 1 March 2013

This page has moved to Cinder-multi-backend