You need to open a ticket. Function does not work. https://mail-archives.apache.org/mod_mbox/cloudstack-users/201605.mbox/%3c1758309532.2299279.1463265113050.javamail.zim...@arhont.com%3E
2016-06-07 3:58 GMT+03:00 ilya <ilya.mailing.li...@gmail.com>: > I see in the code setCacheMode for KVM is there - i'm not certain how to > invoke it to use writeback. > > > https://git-wip-us.apache.org/repos/asf?p=cloudstack.git&a=search&h=HEAD&st=grep&s=setCacheMode > > On 6/6/16 7:26 AM, Vladimir Melnik wrote: > > Dear colleagues, > > > > I've found why guest's storage performance was much less than host's > performance (the mistake was too stupid to tell about it, really). > > > > But I'd like to ask one more question if you don't mind. :) I played > with various KVM options (cache, io and so on...) and now I can say that I > got most IOpS with cache=writeback. Tests are being performed with the fio > utility, here is the jobfile contents: > > [readtest] > > blocksize=4k > > filename=/dev/vdb > > rw=randread > > direct=1 > > buffered=0 > > ioengine=libaio > > iodepth=32 > > size=20% > > > > [writetest] > > blocksize=4k > > filename=/dev/vdb > > rw=randwrite > > direct=1 > > buffered=0 > > ioengine=libaio > > iodepth=32 > > size=20% > > > > Is there any way to make ACS run create KVM domains with cache=writeback > instead of cache=none without patching the source code? > > > > Thank you! > > >
