[Xen-API] Frequent I/O error of HTTP server and memory error on XenServer5.6 FP1

[Frank <frank@xxxxxxxxx>]

Hi,
    I am using XenServer5.6 FP1 GA release with openvswitch as network 
backend. When I create VM through xapi,  "apache.xmlrpc.XmlRpcException: 
I/O error" happens very frequently. At meanwhile my xencenter lost 
connection to hosts.
    Another thing is when I tried to kill VMs from xencenter, it 
complains "Internal error:Sys_error("Thread.create: Cannot allocate 
memory")", see attached picture.
    does anyone meet similar errors?
    Thank you.

Attachment: memory-error.JPG
Description: JPEG image

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