Problem with Server Pool

Hello,
I have an pool of physical servers at the company that supports the production environment of virtual servers.
This pool have 4 (0, 1, 2 and 3) domain servers.
I recently had a problem with the OVS-AGENT, and had to restart the whole pool.
After that, all virtual servers I start at the pool, using the VM Manager, always start at the same domain server, the domain number 3.
When I force the start using xm create, I can start the virtual server at domain server 0, 1 and 2 too.
The live migration only works with the shell command (xm migrate -l), using the VM Manager simple do nothing.
I try to force an especific virtual machine to run at an especific node, using Placement Policy at VM Manager, but when I try to start the server, this error occurs:
Start - /OVS/running_pool/441_n_psgl04
PowerOn Failed : Result - failed:errcode=20000, errmsg=No enough memory to run vm(/OVS/running_pool/441_n_psgl04), required memory=16384.
StackTrace:
File "/opt/ovs-agent-2.3/OVSSiteVM.py", line 124, in start_vm
raise e
Any idea what's happening? Is that some problem with the ovs-agent's database? How can I fix that with minimum of outage of the virtual servers?
I'm really concerned about this problem because this weekend we had a stop on the network that caused the restart of the cluster, and when the servers came back, all virtual servers started up on the same physical server, which caused a lack of resources.
Thanks for your help, and sorry about my poor english!

843474 wrote:
PowerOn Failed : Result - failed:errcode=20000, errmsg=No enough memory to run vm(/OVS/running_pool/441_n_psgl04), required memory=16384.You don't have enough memory on the target server to start this guest. So, you need to work out why you don't have enough memory or why Oracle VM Manager isn't seeing all your servers. Check to see if all the servers are listed as "Active" on the servers tab of Oracle VM Manager. Also, you can try and restore the ovs-agent database to the entire pool by clicking the "Restore" button on the Server Pools tab.

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