oVirt 3.2 Small Test System Admin Notes
I'm testing oVirt in the office to get a few things straight - I'm going to try and keep track of my experiences here.
For comparison, I'm running oVirt 3.2 on Fedora 18.
Can't start VM - Host swap percentage error
My first problem (I'm using a fairly constrained single-host setup initially) is that I am very short of memory on my test host. oVirt refuses to start VMs when swap usage is over a threshold. I couldn't find anywhere in the management pages to set this threshold, and a good bit of googling returned mainly development threads on the subject of memory and swap handling in larger environments.
Below I have shown the solution to the error message I received:
Cannot run VM. Host swap percentage is above the defined threshold. – Check your configuration parameters for Host Swap Percentage.To increase the defined threshold (or just check the current value), here are the commands:
* Check the current value:
[root@ov01 ~]# engine-config -g BlockMigrationOnSwapUsagePercentage* Expected output:
BlockMigrationOnSwapUsagePercentage: 0 version: general* Set the value (to 75% usage in this example):
engine-config -s BlockMigrationOnSwapUsagePercentage=75 -cver=general
* Re-start the engine service:
systemctl restart ovirt-engine.service
Hope this helps someone, I'm sure I'll come back to it again if I build out any more small test systems