Re: [Users] Question about: Host swap percentage is above the defined threshold.
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
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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);
}