[Kimchi-devel] [PATCH] bug fix: setup disks to use cache=none to support live migration.

[Aline Manera]

On 03/05/2014 11:44 PM, Sheldon wrote:
> On 03/06/2014 08:46 AM, Royce Lv wrote:
>> On 2014年03月05日 23:51, Paulo Vital wrote:
>>> When executing a virsh live migration of a VM created by Kimchi, the
>>> migration stops due to miss configuration "cache=none" on disk's
>>> performance parameters.
>> I'm little worried about make cache 'none' will cause performance 
>> downgrade for guest in daily running.
>> Can we allow update this parameter in vm disk edit and change it when 
>> we decide to live migrate a vm?
> Agree.

Patches are welcome! =)

>>>
>>> Signed-off-by: Paulo Vital <pvital at linux.vnet.ibm.com>
>>> ---
>>>   src/kimchi/vmtemplate.py | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/src/kimchi/vmtemplate.py b/src/kimchi/vmtemplate.py
>>> index e2d78a4..89b5e72 100644
>>> --- a/src/kimchi/vmtemplate.py
>>> +++ b/src/kimchi/vmtemplate.py
>>> @@ -152,7 +152,7 @@ class VMTemplate(object):
>>>               params = {'src': src, 'dev': dev, 'bus': 
>>> self.info['disk_bus']}
>>>               ret += """
>>>               <disk type='file' device='disk'>
>>> -              <driver name='qemu' type='qcow2'/>
>>> +              <driver name='qemu' type='qcow2' cache='none'/>
>>>                 <source file='%(src)s' />
>>>                 <target dev='%(dev)s' bus='%(bus)s' />
>>>               </disk>
>>> @@ -182,7 +182,7 @@ class VMTemplate(object):
>>>           # Passthrough configuration
>>>           disk_xml = """
>>>               <disk type='volume' device='lun'>
>>> -              <driver name='qemu' type='raw'/>
>>> +              <driver name='qemu' type='raw' cache='none'/>
>>>                 <source dev='%(src)s'/>
>>>                 <target dev='%(dev)s' bus='scsi'/>
>>>               </disk>"""
>>
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>
>