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" <[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
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