Troubleshooting
Problem
This document describes a problem that surfaced after trying to deploy using VIOS hosts that were recently added (managed) to PowerVC.
Symptom
Deploys failed after adding new VIOS hosts to environment.
Diagnosing The Problem
Nova compute log shows:
2016-08-19 15:49:39.790 26020 WARNING powervc_nova.compute
...
Deploy of virtual machine
ibm-test1 on host TestHost failed with exception:
Build of instance abc8f049-3d8b-4e92-a298-2f20eb03eacd was
re-scheduled: PC-D855351 Unable to attach storage hdisk1 to virtual
machine ibm-test1-abc8f049-00000305. PC-424D47A Unable to configure
storage adapters for virtual machine bbbbbb-test1-abc8f049-00000305 on
the required number of Virtual I/O Servers for the volume. Minimum
number of Virtual I/O Servers required per volume: 2. 0) PC-95C6BE6
Failed to discover hdisk on powervcvios06 for volume
a5dde631-9c9f-4980-9072-3969a18fb262. status: 7
Resolving The Problem
It was discovered that the VIOS partitions that were failing were missing the packages for SDDPCM required for MPIO (multi-path).
Here is an excerpt from PowerVC documentation:
"...
Be aware of these considerations when using vSCSI attached storage.
For vSCSI attachments, the supported multipathing software driver solutions are AIX® path control module (PCM), EMC PowerPath, and Subsystem Device Driver Path Control Module (SDDPCM) 2.6.6.0 or later.
The number of volumes that can be attached to a virtual machine is not limited by PowerVC. However, each virtual machine's operating system limits how many volumes its vSCSI driver supports.
PowerVM® supports migration only between Virtual I/O Servers that use the same multipathing software driver solution.
For EMC storage, see "Planning for EMC VMAX storage" or "Planning for EMC VNX storage" for additional vSCSI information and requirements.
..."
http://www.ibm.com/support/knowledgecenter/SSXK2N_1.3.1/com.ibm.powervc.standard.help.doc/powervc_storage_vscsi_before.html
Was this topic helpful?
Document Information
Modified date:
17 June 2018
UID
nas8N1021605