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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