[CLOUDSTACK-9586] When using local storage with Xenserver prepareTemplate does not work with multiple primary store

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 4.5.2
• Fix Version/s: 4.9.1.0, 4.8.2.0, 4.10.1.0
• Component/s: Secondary Storage, XenServer
• Security Level: Public (Anyone can view this level - this is the default.)
• Environment: XenServer 6.5 SP1; Local Storage
• Assignee: Abhinandan Prateek
• Reporter: Abhinandan Prateek
• Created: 10/Nov/16 06:24
• Updated: 19/Dec/17 08:58
• Resolved: 19/Dec/17 08:58

Description

2016-11-09 15:05:15,876 DEBUG [c.c.h.x.r.XenServerStorageProcessor] (DirectAgent-29:ctx-8d890b55) Failed to destroy pbd
SR_BACKEND_FAILURE_40The SR scan failed [opterr=['INTERNAL_ERROR', 'Db_exn.Uniqueness_constraint_violation("VDI", "uuid", "703f59ca-6e5e-38d3-bbef-707b5b14c704")']]
at com.xensource.xenapi.Types.checkResponse(Types.java:2021)
at com.xensource.xenapi.Connection.dispatch(Connection.java:395)
at com.cloud.hypervisor.xenserver.resource.XenServerConnectionPool$XenServerConnection.dispatch(XenServerConnectionPool.java:462)
at com.xensource.xenapi.SR.scan(SR.java:1257)
at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.createFileSR(Xenserver625StorageProcessor.java:113)
at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.createFileSr(Xenserver625StorageProcessor.java:139)
at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.copyTemplateToPrimaryStorage(Xenserver625StorageProcessor.java:173)

Root Cause: CloudPlatform creates a SR on each host, which points to the template location on the secondary storage (secondary_Storage/template/tmpl/<account_id>/<template_id>). This causes the database unique constraint violation when each XenServer tries to scan the SR created on each host. The host that scans the SR last, throws the exception because VDI was recognized already from the SR scan of the first host.

Issue Links

• links to: GitHub Pull Request #2342