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" <[email protected]> > To: "users" <[email protected]> > 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 <[email protected]>: > >> 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 <[email protected]> >> 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" <[email protected]> >> >>> To: "users" <[email protected]> >> >>> 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 <[email protected]> >> >>> Sent: Thursday, May 12, 2016 7:07 AM >> >>> To: [email protected] >> >>> 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 <[email protected]>: >> >>> >> >>> 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" <[email protected]> >> >>>>> To: "users" <[email protected]> >> >>>>> 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:[email protected]] >> >>>>> 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 >> >>>>> ========== >> >>>>> This e-mail may contain privileged and confidential information which >> >>>>> is >> >>>>> >> >>>> the >> >>>> >> >>>>> property of Accelerite, a Persistent Systems business. It is intended >> >>>>> >> >>>> only for >> >>>> >> >>>>> the use of the individual or entity to which it is addressed. If you >> >>>>> are >> >>>>> >> >>>> not >> >>>> >> >>>>> the intended recipient, you are not authorized to read, retain, copy, >> >>>>> >> >>>> print, >> >>>> >> >>>>> distribute or use this message. If you have received this >> communication >> >>>>> >> >>>> in >> >>>> >> >>>>> error, please notify the sender and delete all copies of this >> message. >> >>>>> Accelerite, a Persistent Systems business does not accept any >> liability >> >>>>> >> >>>> for >> >>>> >> >>>>> virus infected mails. >> >>>>> >> >>>> >> > >> >> >> -- >> >> Andrija Panić
