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<DIV><FONT color=#000000 size=3 face=宋体>Thanks
zhiteng!</FONT></DIV>
<DIV>I'm referring to HA of nova-scheduler by deploying multiple of it to
several hosts.</DIV>
<DIV> </DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana>2013-02-19</FONT></DIV>
<DIV align=left><FONT size=2 face=Verdana>
<HR style="WIDTH: 122px; HEIGHT: 2px" id=SignNameHR align=left SIZE=2>
</FONT></DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana><SPAN
id=_FlashSignName>Wangpan</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Verdana>
<HR>
</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发件人：</STRONG>Huang Zhiteng</FONT></DIV>
<DIV><FONT size=2
face=Verdana><STRONG>发送时间：</STRONG>2013-02-19 10:59</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>主题：</STRONG>Re: Re: [Openstack] [Nova]
Question about multi-scheduler</FONT></DIV>
<DIV><FONT size=2
face=Verdana><STRONG>收件人：</STRONG>"Wangpan"<hzwangpan@corp.netease.com></FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>抄送：</STRONG>"openstack
_社区"<openstack@lists.launchpad.net></FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>
<DIV>Oh, I got it. I remember in last conference, Ryan Richard's </DIV>
<DIV>'consideration for building an openstack private cloud' mentioned </DIV>
<DIV>using more than one scheduler instances to do HA when the cluster </DIV>
<DIV>becomes large (this is not in his slides where you can find on </DIV>
<DIV>slideshare.net but he orally mentioned it). But he also mentioned </DIV>
<DIV>that adding more scheduler instances didn't help reducing processing </DIV>
<DIV>time, which I suspect it won't reduce processing time for single </DIV>
<DIV>request but it surely increase the concurrency of scheduler so should </DIV>
<DIV>be helpful for large number of requests use case. </DIV>
<DIV> </DIV>
<DIV>Are you referring to certain new feature of Nova when saying 'multi </DIV>
<DIV>scheduler property' or just referring to any method that running </DIV>
<DIV>multiple nova scheduler instances? </DIV>
<DIV> </DIV>
<DIV>For latter, I think this is surely doable and someone out there has </DIV>
<DIV>been using this kind of technique (in production I guess). </DIV>
<DIV> </DIV>
<DIV>On Tue, Feb 19, 2013 at 10:34 AM, Wangpan <hzwangpan@corp.netease.com> wrote: </DIV>
<DIV>> Hi Zhiteng, </DIV>
<DIV>> </DIV>
<DIV>> May what I said in the last mail is confused, </DIV>
<DIV>> What I want to ask is that, can we use more than one nova-scheduler service </DIV>
<DIV>> in one cluster? is it stable enough to be used in the production </DIV>
<DIV>> environment? </DIV>
<DIV>> Because I want to make the availability of scheduler service higher. </DIV>
<DIV>> </DIV>
<DIV>> thanks! </DIV>
<DIV>> 2013-02-19 </DIV>
<DIV>> ________________________________ </DIV>
<DIV>> Wangpan </DIV>
<DIV>> ________________________________ </DIV>
<DIV>> 发件人：Huang Zhiteng </DIV>
<DIV>> 发送时间：2013-02-19 10:15 </DIV>
<DIV>> 主题：Re: [Openstack] [Nova] Question about multi-scheduler </DIV>
<DIV>> 收件人："Wangpan"<hzwangpan@corp.netease.com> </DIV>
<DIV>> 抄送："openstack _社区"<openstack@lists.launchpad.net> </DIV>
<DIV>> </DIV>
<DIV>> Multi-scheduler was there for the days when Nova has to deal with both </DIV>
<DIV>> request for instance and volume. If you are using a version of Nova </DIV>
<DIV>> which still has nova-volume, I think multi-scheduler is a must. And </DIV>
<DIV>> there are two sub config option for Nova: </DIV>
<DIV>> http://docs.openstack.org/folsom/openstack-compute/admin/content/ch_scheduling.html </DIV>
<DIV>> scheduler_driver=nova.scheduler.multi.MultiScheduler </DIV>
<DIV>> volume_scheduler_driver=nova.scheduler.chance.ChanceScheduler </DIV>
<DIV>> compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler </DIV>
<DIV>> </DIV>
<DIV>> But if you are using trunk version Nova, scheduler_driver should use </DIV>
<DIV>> 'nova.scheduler.filter_scheduler.FilterScheduler' directly. </DIV>
<DIV>> </DIV>
<DIV>> On Tue, Feb 19, 2013 at 10:06 AM, Wangpan <hzwangpan@corp.netease.com> </DIV>
<DIV>> wrote: </DIV>
<DIV>>> Hi all, </DIV>
<DIV>>> </DIV>
<DIV>>> Is there anyone has used the multi-scheduler property, is there any </DIV>
<DIV>>> problem? </DIV>
<DIV>>> Can we use this property into production environment? </DIV>
<DIV>>> </DIV>
<DIV>>> Thanks! </DIV>
<DIV>>> 2013-02-19 </DIV>
<DIV>>> ________________________________ </DIV>
<DIV>>> Wangpan </DIV>
<DIV>>> </DIV>
<DIV>>> _______________________________________________ </DIV>
<DIV>>> Mailing list: https://launchpad.net/~openstack </DIV>
<DIV>>> Post to : openstack@lists.launchpad.net </DIV>
<DIV>>> Unsubscribe : https://launchpad.net/~openstack </DIV>
<DIV>>> More help : https://help.launchpad.net/ListHelp </DIV>
<DIV>>> </DIV>
<DIV>> </DIV>
<DIV>> </DIV>
<DIV>> </DIV>
<DIV>> -- </DIV>
<DIV>> Regards </DIV>
<DIV>> Huang Zhiteng </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>-- </DIV>
<DIV>Regards </DIV>
<DIV>Huang Zhiteng </DIV></FONT></DIV></BODY></HTML>