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https://issues.apache.org/jira/browse/CLOUDSTACK-9025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254078#comment-16254078
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ASF GitHub Bot commented on CLOUDSTACK-9025:
--------------------------------------------
mike-tutkowski commented on a change in pull request #2315: A comprehensive
solution for #CLOUDSTACK-9025.
URL: https://github.com/apache/cloudstack/pull/2315#discussion_r151237628
##########
File path: engine/schema/src/com/cloud/host/dao/HostDao.java
##########
@@ -103,4 +95,13 @@
List<HostVO> listByType(Type type);
HostVO findByIp(String ip);
+
+ /**
+ * This method will look for a host that is connected to the storage pool
where the volume of the Snapshot is stored.
+ * <ul>
+ * <li>If the storage pool found for the volume of the snapshotId has more
than a host, we will choose one randomly;
+ * <li>If no host is found, we throw a runtime exception
+ * </ul>
+ */
+ HostVO findHostToOperateOnSnapshot(long snapshotId);
Review comment:
On XenServer, making use of a volume snapshot that resides on primary
storage needs to leverage a XenServer host that supports UUID resigning. UUID
resigning is available as a patch for XenServer (@syed created it in 2016).
When the CSMS connects with a XenServer host, it checks to see if this patch is
installed. The results of the check are stored in cloud.host_details (the
supportsResign property). If any host in the cluster supports UUID resigning,
then the "convenience" property, also called supportsResign, in
cloud.cluster_details is set to true. That being the case, we need to find one
of these hosts in the zone when leveraging a managed snapshot on XenServer.
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> Unable to deploy VM instance from template if template spin from linked clone
> snapshot
> --------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-9025
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9025
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: XenServer
> Affects Versions: 4.5.2
> Environment: XenServer 6.5
> Reporter: Anshul Gangwar
> Assignee: Anshul Gangwar
> Priority: Critical
> Fix For: 4.6.0
>
>
> As default, CloudStack create linked clone snapshot for VM instance . When we
> take a snapshot for the VM, and create a template based on such snapshot,
> CloudStack only download incremental VHD as template file, as a result, the
> VM instance fail to deploy as it is incomplete.
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