[CLOUDSTACK-187] CloudStack reports incorrect CPU & RAM usage values for hosts in Basic zone

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: pre-4.0.0
• Fix Version/s: 4.1.0
• Component/s: Management Server, Usage, XenServer
• Security Level: Public (Anyone can view this level - this is the default.)
• Environment: CloudStack: version 2.2.14.20120210101530; Hypervisors: XenServer 5.6.100-47101p; Zones: one Basic and one Advanced zones are defined, each consisting of single XenServer host.
• Assignee: Nitin Mehta
• Reporter: Vladimir Ostrovsky
• Created: 22/Sep/12 12:53
• Updated: 04/Jun/13 18:51
• Resolved: 14/May/13 11:25

Description

CloudStack reports incorrect CPU & RAM usage values for hosts in Basic zone.
CPU usage is reported about 90%, when "top", XenCenter and other tools report that actual usage is about 1%.

The "command=listCapacity&zoneid=1&type=1" returns something like "<percentused>90.49</percentused>".

The only way I found to get rid of this, is to:

• place the host into Maintenance mode,
• remove it from its Cluster,
• add the host again.

After this procedure, correct values are reported.

Interesting that in my practice it happens thrice for hosts in Basic zone, and never - for hosts in Advanced.