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From Yuriy Karpel <yu...@karpel.su>
Subject Re: Storage Performance
Date Tue, 07 Jun 2016 06:44:15 GMT
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.zimbra@arhont.com%3E

2016-06-07 3:58 GMT+03:00 ilya <ilya.mailing.lists@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!
> >
>

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