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From "(IMIS) Enzo Bettini" <enz...@imisglobal.com>
Subject Re: KVM disk cache option has no effect
Date Thu, 25 Aug 2016 08:22:41 GMT
Hi,

I can confirm the same behavior on CentOS 7.2.1511 with CloudStack 4.8.0.

Regards,
Enzo

On 25/08/2016 09:42, Andrei Mikhailovsky wrote:
> I've noticed the same behaviour on kvm with ubuntu 14.04 servers on acs 4.7.1.1
>
> Andrei
>
> ----- Original Message -----
>> From: "Yuriy Karpel" <yuriy@karpel.su>
>> To: "users" <users@cloudstack.apache.org>
>> Sent: Thursday, 25 August, 2016 07:58:56
>> Subject: Re: KVM disk cache option has no effect
>> CentOS management and kvm node, Cloudstack 4.7.1, Storage RBD.
>>
>> Added value in the table, UI shows that the caching policy WB:
>>
>> 151 4 test_cache a6c0b591-0ca7-4938-91f4-8ed961f490b6 test_cache 0 Disk
>> (null) 0 0 (null) 0 1 (null) 25.08.2016 6:35:07 0 1 (null) (null) (null)
>> (null) (null) (null) (null) Active (null) writeback thin
>>
>>
>>
>> Created drive and connected it to the VM, the cache setting is "none":
>>
>>     <disk type='network' device='disk'>
>>       <driver name='qemu' type='raw' cache='none'/>
>>       <auth username='admin'>
>>         <secret type='ceph' uuid='f5efdbfb-8fe7-3dfd-bc07-5088222d8b84'/>
>>       </auth>
>>       <source protocol='rbd'
>> name='rbd-cl/59053122-a711-45d5-a801-8b3858d84cdc'>
>>         <host name='ceph-mon.test.cloud' port='6789'/>
>>       </source>
>>       <backingStore/>
>>       <target dev='vdb' bus='virtio'/>
>>       <serial>59053122a71145d5a801</serial>
>>       <alias name='virtio-disk1'/>
>>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
>> function='0x0'/>
>>     </disk>
>>
>>
>>
>>
>>
>> 2016-08-24 17:27 GMT+03:00 Andrija Panic <andrija.panic@gmail.com>:
>>
>>> Hi Enzo,
>>>
>>> just go to table/view "disk_offering_view" and in the field "cache_mode"
>>> insert "writeback" value....
>>>
>>> Be aware, that if using writeback cache with CEPH - this is not really
>>> needed, and perhaps better to use RBD cache on ceph.conf on KVM side...
>>> Also note, with writeback cache set - if using NFS as storage - live
>>> migrations will not work !
>>> With ceph and writeback cache, live migration works (libvirt limitation,
>>> you can google it).
>>>
>>> Best,
>>> Andrija
>>>
>>> On 24 August 2016 at 10:24, (IMIS) Enzo Bettini <enzo.b@imisglobal.com>
>>> wrote:
>>>
>>>> Hi Andrei,
>>>>
>>>> How did you get around this? Did you manually update the VM configuration
>>>> using virsh edit?
>>>>
>>>> Regards,
>>>> Enzo
>>>>
>>>>
>>>> On 15/05/2016 00:31, Andrei Mikhailovsky wrote:
>>>>
>>>>> Not as far as I know (. The ticket status is closed
>>>>>
>>>>> Andrei
>>>>>
>>>>> ----- Original Message -----
>>>>>
>>>>>> From: "Simon Weller" <sweller@ena.com>
>>>>>> To: "users" <users@cloudstack.apache.org>
>>>>>> Sent: Thursday, 12 May, 2016 14:38:35
>>>>>> Subject: Re: KVM disk cache option has no effect
>>>>>> All,
>>>>>>
>>>>>> Is there a current issue in Jira on this?
>>>>>>
>>>>>> - Si
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ________________________________________
>>>>>> From: Yuriy Karpel <yuriy@karpel.su>
>>>>>> Sent: Thursday, May 12, 2016 7:07 AM
>>>>>> To: users@cloudstack.apache.org
>>>>>> Subject: Re: KVM disk cache option has no effect
>>>>>>
>>>>>> The same function does not work on centos + ceph. CloudStack 4.7.1
>>>>>>
>>>>>> 2016-05-12 14:29 GMT+03:00 Andrei Mikhailovsky <andrei@arhont.com>:
>>>>>>
>>>>>> Hi Shweta,
>>>>>>> thanks for your findings. I am very much surprised to see this
was not
>>>>>>> discovered earlier, especially since this feature has been implemented
>>>>>>> many
>>>>>>> versions back (back in version 4.4 or 4.5 i think). I was under
the
>>>>>>> impression that people are testing and reporting on the new features
>>>>>>> before
>>>>>>> they hit the release, which apparently is not the case, at least
for
>>>>>>> some
>>>>>>> new features. From what I can see this feature was completed
about a
>>>>>>> year
>>>>>>> ago.
>>>>>>>
>>>>>>> I've tried to reopen this issue, but i don't have the rights
due to
>>> the
>>>>>>> Jira being in a temporary Lockdown mode.
>>>>>>>
>>>>>>> Could someone with the right access reopen this issue on the
grounds
>>>>>>> that
>>>>>>> it was reported (by at least two individuals) that this feature
is not
>>>>>>> working.
>>>>>>>
>>>>>>> Many thanks
>>>>>>>
>>>>>>> Andrei
>>>>>>>
>>>>>>> ----- Original Message -----
>>>>>>>
>>>>>>>> From: "Shweta Agarwal" <shweta.agarwal1@accelerite.com>
>>>>>>>> To: "users" <users@cloudstack.apache.org>
>>>>>>>> Sent: Thursday, 12 May, 2016 12:02:59
>>>>>>>> Subject: RE: KVM disk cache option has no effect
>>>>>>>> Hi Andrei,
>>>>>>>>
>>>>>>>> Few days back I was also doing some testing in this area
and then we
>>>>>>>>
>>>>>>> found out
>>>>>>>
>>>>>>>> that cache field in disk offering is just a UI or API parameter.
But
>>> in
>>>>>>> actual
>>>>>>>
>>>>>>>> implementation of the API we are just neglecting this parameter
. So
>>>>>>>> effectively these parameters in disk offering does nothing
 .
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>> Shweta
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: Andrei Mikhailovsky [mailto:andrei@arhont.com]
>>>>>>>> Sent: Thursday, May 12, 2016 4:07 PM
>>>>>>>> To: users
>>>>>>>> Subject: KVM disk cache option has no effect
>>>>>>>>
>>>>>>>> Hello
>>>>>>>>
>>>>>>>> I've been trying to use cache = writeback option for my KVM
>>> hypervisor
>>>>>>> with ceph
>>>>>>>
>>>>>>>> backend storage. However, when I am launching a vm that uses
the disk
>>>>>>>>
>>>>>>> offering
>>>>>>>
>>>>>>>> with cache=writeback, the cache setting is still set to =none
>>> according
>>>>>>> to the
>>>>>>>
>>>>>>>> ps aux command.The same applies to the root as well as additional
>>> data
>>>>>>> volumes.
>>>>>>>
>>>>>>>> I am using ACS 4.7.1, both management and hypervisor servers
are
>>> Ubuntu
>>>>>>> 14.04.
>>>>>>>
>>>>>>>> Could someone please advise on how enable writeback cache?
>>>>>>>>
>>>>>>>> Cheers
>>>>>>>>
>>>>>>>> Andrei
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> DISCLAIMER
>>>>>>>> ==========
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which
>>>>>>>> is
>>>>>>>>
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>>> --
>>>
>>> Andrija Panić


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