Try using VDSM hooks
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/html/administration_guide/vdsm_hooks_environment
I am using vdsm-hook-diskunmap as model.
dnf install vdsm-hook-diskunmap
cp /usr/libexec/vdsm/hooks/before_vm_start/50_diskunmap
/usr/libexec/vdsm/hooks/before_vm_start/99_max_sectors
After editing the file, the result is bellow
# on host
egrep -v \^$ /usr/libexec/vdsm/hooks/before_vm_start/99_max_sectors
#!/usr/bin/python3
from __future__ import absolute_import
from __future__ import print_function
'''
Hook to set max_sectors on SCSI controller, virtio-scsi model
Syntax:
max_sectors=(256|128|64)
Example:
max_sectors=256
'''
import os
import sys
import traceback
from xml.dom import minidom
import hooking
def addmax_sectors(domxml):
max_sectorsConfig = os.environ['max_sectors']
for controller in domxml.getElementsByTagName('controller'):
model = controller.getAttribute('model')
if (model == 'virtio-scsi'):
driver = controller.getElementsByTagName('driver')[0]
driver.setAttribute('max_sectors', max_sectorsConfig)
def main():
if 'max_sectors' in os.environ:
max_sectorsConfig = os.environ['max_sectors']
domxml = hooking.read_domxml()
if (max_sectorsConfig == '256' or max_sectorsConfig == '128' or
max_sectorsConfig == '64'):
addmax_sectors(domxml)
hooking.write_domxml(domxml)
def test():
text = '''<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='2' iothread='1'/>
<alias name='ua-c410327a-e4af-482a-966b-12cff96fea06'/>
<address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
</controller>'''
xmldom = minidom.parseString(text)
controller = xmldom.getElementsByTagName('controller')[0]
print("\nController device definition before execution: \n%s"
% controller.toxml(encoding='UTF-8'))
addmax_sectors(xmldom)
print("\nController device after setting max_sectors attribute: \n%s"
% controller.toxml(encoding='UTF-8'))
if __name__ == '__main__':
try:
if '--test' in sys.argv:
test()
else:
main()
except:
hooking.exit_hook(' max_sectors hook: [unexpected error]: %s\n' %
traceback.format_exc())
# on oVirt hosted engine
# list current VM custom properties
engine-config -l
# add VM custom properties
engine-config -s UserDefinedVMProperties='max_sectors=^(256|128|64)$' --cver=4.6
# check VM custom properties
engine-config -g UserDefinedVMProperties
systemctl restart ovirt-engine.service
For me it's working with
max_sectors 256
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