2:55 p.m.
I also worried about that, but I know that the performance team in the
past said it was okay, as long as you're running a newer OS:
https://ltc3.linux.ibm.com/wiki/LinuxPerformance/KVM-Performance-Tuning
We might want to check with the performance team, unless there's a
specific case which we know will be impacted by cache=none.
Regards,
Christy
On Thu, 2014-03-06 at 12:23 -0300, Aline Manera wrote:
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(a)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>"""
>>
>> _______________________________________________
>> Kimchi-devel mailing list
>> Kimchi-devel(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/kimchi-devel
>
>
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