On 11/29/2012 09:17 PM, Daniel Rowe wrote:

Hi

I currently have a one node ovirt setup I am migrating VMs to.

I have reached a point where trying to start new VMs I get:

Error while executing action: Cannot run VM. Host swap percentage is above the defined threshold. - Check your configuration parameters for Host Swap Percentage.

Adjusting the BlockMigrationOnSwapUsagePercentage setting seems to do nothing.

The node does have lots of free RAM and is current sitting at 68%.

The node is a full fedora 17 minimal install and does have a large swap partition on fast 15k SAS disks and 48gig of RAM.

So why is changing the BlockMigrationOnSwapUsagePercentage not doing anything and how do it get more VMs running?

I need to over commit a bit but will be adding a new identical node to spread the load once I get all the VMs off the machine I am migrating from.

I also notice the "Shared Memory" value is 0% why is this so? Do I need to set something to get same page sharing?

Thanks for any advice.

Regards Daniel _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users

code snippet below if you care to run the numbers. code also suggest you can disable the swap check via config. if (!isVMSwapValueLegal(vds)) { sb.append("swap value is illegal"); return VdcBllMessages.ACTION_TYPE_FAILED_VDS_VM_SWAP; } private static boolean isVMSwapValueLegal(VDS vds) { if (!Config.<Boolean> GetValue(ConfigValues.EnableSwapCheck)) { return true; } if (vds.getswap_total() == null || vds.getswap_free() == null || vds.getmem_available() == null || vds.getmem_available() <= 0 || vds.getphysical_mem_mb() == null || vds.getphysical_mem_mb() <= 0) { return true; } long swap_total = vds.getswap_total(); long swap_free = vds.getswap_free(); long mem_available = vds.getmem_available(); long physical_mem_mb = vds.getphysical_mem_mb(); return ((swap_total - swap_free - mem_available) * 100 / physical_mem_mb) <= Config .<Integer> GetValue(ConfigValues.BlockMigrationOnSwapUsagePercentage); }