cloudstack-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-9733) Concurrent volume snapshots of a VM are not allowed and are not limited per host as per the global configuration parameter "concurrent.snapshots.threshold.perhost".
Date Mon, 09 Jan 2017 12:10:58 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15811629#comment-15811629
] 

ASF GitHub Bot commented on CLOUDSTACK-9733:
--------------------------------------------

GitHub user sureshanaparti opened a pull request:

    https://github.com/apache/cloudstack/pull/1897

    CLOUDSTACK-9733: Concurrent volume snapshots of a VM are not allowed and are not limited
per host as per the global configuration parameter "concurrent.snapshots.threshold.perhost".

    - User can take snapshots of the volumes attached to a VM simultaneously (when the underlying
hypervisor supports). Only subsequent snapshot operations are in parallel.
    - User wants to take snapshots of the same volume at the same time (either recurring
mode or manually). Only subsequent snapshot operations are in parallel.
    - User wants to limit the no. of concurrent snapshots per host in the cluster/cloud using
the config paramter "concurrent.snapshots.threshold.perhost" (at the cluster level).

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/Accelerite/cloudstack CLOUDSTACK-9733

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cloudstack/pull/1897.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1897
    
----
commit 46d79f1678399cbd884973358504a2773a61abaf
Author: Suresh Kumar Anaparti <suresh.anaparti@accelerite.com>
Date:   2017-01-09T11:59:48Z

    CLOUDSTACK-9733: Concurrent volume snapshots of a VM are not allowed and are not limited
per host as per the global configuration parameter "concurrent.snapshots.threshold.perhost".

----


> Concurrent volume snapshots of a VM are not allowed and are not limited per host as per
the global configuration parameter "concurrent.snapshots.threshold.perhost".
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-9733
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9733
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Snapshot, Volumes
>            Reporter: Suresh Kumar Anaparti
>            Assignee: Suresh Kumar Anaparti
>             Fix For: 4.10.0.0
>
>
> Pre-CloudStack 4.4.0, before the VM job framework changes (CLOUDSTACK-669), Concurrent
volume (both root and data) snapshots were allowed per host based on the value of global config
"concurrent.snapshots.threshold.perhost". The volumes could belong to the same VM or spread
across multiple VMs on a given host. The synchronisation was done based on the host (Id).
> As part of the VM job framework changes (CLOUDSTACK-669) in CloudStack 4.4.0, a separate
job queue was introduced for individual VMs with a concurrency level of 1 (i.e. all operations
to a given VM are serialized). Volume snapshot was also considered as a VM operation as part
of these changes  and goes through the VM job queue. These changes made the config "concurrent.snapshots.threshold.perhost"
obsolete (it was also no longer getting honoured, since there is no single point of enforcement).
> Only one volume snapshot of a VM is allowed at any given point of time as the sync object
is the VM (id). So concurrent volume snapshots of a VM are not allowed and are not limited
per host as per the global configuration parameter "concurrent.snapshots.threshold.perhost".
> This functionality needs to be re-introduced to execute more than 1 snapshot of a VM
at a time (when the underlying hypervisor supports) and snapshots should be limited per host
based on the value of "concurrent.snapshots.threshold.perhost" at the cluster level (for more
flexibility).



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message