archerslaw

{
  graphitePort: 2003
, graphiteHost: "localhost"
, port: 8125
, backends: [ "./backends/graphite" ]
}

archerslaw

import re
import sys
import os

def filerev(somefile, buffer=256):
  somefile.seek(0, os.SEEK_END)
  size = somefile.tell()
  lines = ['']
  rem = size % buffer
  pos = max(0, (size // buffer - 1) * buffer)

archerslaw

<domain type='kvm'>
  <name>sluo_kvm_example</name>
  <uuid>fd509219-5ace-4102-90bd-d4312a85a363</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>

archerslaw

# /bin/systemctl restart  libvirtd.service
# /bin/systemctl enable  libvirtd.service

Note:
How to turn on the debug logs for libvirtd.
1)open /etc/libvirt/libvirtd.conf in your favourite editor.
2)find & replace, or set these variables:
log_level = 1
log_filters="3:remote 4:event 3:json 3:rpc" | log_filters="1:qemu_monitor_json"
log_outputs="1:file:/var/log/libvirt/libvirtd.log"

archerslaw

# QEMU Monitor Protocol Python class
#
# Copyright (C) 2009 Red Hat Inc.
#
# This work is licensed under the terms of the GNU GPL, version 2.  See
# the COPYING file in the top-level directory.

import socket, json, time, commands
from optparse import OptionParser

archerslaw

import libvirt
conn = libvirt.open('qemu:///system')
for id in conn.listDomainsID():
	dom = conn.lookupByID(id)
	print "Dom %s  State %s" % ( dom.name(), dom.info()[0] )
	dom.suspend()
	print "Dom %s  State %s (after suspend)" % ( dom.name(), dom.info()[0] )
	dom.resume()
	print "Dom %s  State %s (after resume)" % ( dom.name(), dom.info()[0] )
	dom.destroy()

archerslaw

###### Bridge network configuration.

# cat /etc/qemu-ifup 
#!/bin/sh
switch=switch
/sbin/ifconfig $1 0.0.0.0 up
/usr/sbin/brctl addif ${switch} $1

# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"

archerslaw

- AMD & Intel:

Opteron_G4: avx,xsave,aes,sse4.2,sse4.1,cx16,ssse3,sse4a

Opteron_G3: cx16,sse4a

Opteron_G2: cx16

Opteron_G1: no cx16

archerslaw

##
# @BlockdevOptionsBase
#
# Options that are available for all block devices, independent of the block
# driver.
#
# @driver:      block driver name
# @id:          #optional id by which the new block device can be referred to.
#               This is a required option on the top level of blockdev-add, and
#               currently not allowed on any other level.

archerslaw

Test Matrix:
      Filesystem: ext4 and xfs and scsi_debug for host side, and ext4 or xfs for guest side.
      Backend: localfile or iSCSI or libiscsi (Note: BZ#1037503 glusterfs not support discard).
      Disk Format: RAW for passthrough, RAW/qcow2 for localfile.
      Disk Interface: scsi-block/scsi-hd/ide/ahci for UNMAP mode, scsi-block/scsi-hd interface for WRITE SAME mode.
      NOTE: Persistent reservations *cannot* be used with discard when QEMU run as non-root user, but can work well in root user.(BZ966883#c5)

Windows only supports automatic discard (like "-o discard" in Linux).  
You can check that discard is enabled by running.