openstack team mailing list archive

["Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx>]

Thanks zhiteng!
I'm referring to HA of nova-scheduler by deploying multiple of it to several hosts.

2013-02-19



Wangpan



发件人：Huang Zhiteng
发送时间：2013-02-19 10:59
主题：Re: Re: [Openstack] [Nova] Question about multi-scheduler
收件人："Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx>
抄送："openstack _社区"<openstack@xxxxxxxxxxxxxxxxxxx>

Oh, I got it.  I remember in last conference, Ryan Richard's 
'consideration for building an openstack private cloud' mentioned 
using more than one scheduler instances to do HA when the cluster 
becomes large (this is not in his slides where you can find on 
slideshare.net but he orally mentioned it).  But he also mentioned 
that adding more scheduler instances didn't help reducing processing 
time, which I suspect it won't reduce processing time for single 
request but it surely increase the concurrency of scheduler so should 
be helpful for large number of requests use case. 

Are you referring to certain new feature of Nova when saying 'multi 
scheduler property' or just referring to any method that running 
multiple nova scheduler instances? 

For latter, I think this is surely doable and someone out there has 
been using this kind of technique (in production I guess). 

On Tue, Feb 19, 2013 at 10:34 AM, Wangpan <hzwangpan@xxxxxxxxxxxxxxxx> wrote: 
> Hi Zhiteng, 
> 
> May what I said in the last mail is confused, 
> What I want to ask is that, can we use more than one nova-scheduler service 
> in one cluster? is it stable enough to be used in the production 
> environment? 
> Because I want to make the availability of scheduler service higher. 
> 
> thanks! 
> 2013-02-19 
> ________________________________ 
> Wangpan 
> ________________________________ 
> 发件人：Huang Zhiteng 
> 发送时间：2013-02-19 10:15 
> 主题：Re: [Openstack] [Nova] Question about multi-scheduler 
> 收件人："Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx> 
> 抄送："openstack _社区"<openstack@xxxxxxxxxxxxxxxxxxx> 
> 
> Multi-scheduler was there for the days when Nova has to deal with both 
> request for instance and volume.  If you are using a version of Nova 
> which still has nova-volume, I think multi-scheduler is a must.  And 
> there are two sub config option for Nova: 
> http://docs.openstack.org/folsom/openstack-compute/admin/content/ch_scheduling.html 
> scheduler_driver=nova.scheduler.multi.MultiScheduler 
> volume_scheduler_driver=nova.scheduler.chance.ChanceScheduler 
> compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler 
> 
> But if you are using trunk version Nova, scheduler_driver should use 
> 'nova.scheduler.filter_scheduler.FilterScheduler' directly. 
> 
> On Tue, Feb 19, 2013 at 10:06 AM, Wangpan <hzwangpan@xxxxxxxxxxxxxxxx> 
> wrote: 
>> Hi all, 
>> 
>> Is there anyone has used the multi-scheduler property, is there any 
>> problem? 
>> Can we use this property into production environment? 
>> 
>> Thanks! 
>> 2013-02-19 
>> ________________________________ 
>> Wangpan 
>> 
>> _______________________________________________ 
>> Mailing list: https://launchpad.net/~openstack 
>> Post to     : openstack@xxxxxxxxxxxxxxxxxxx 
>> Unsubscribe : https://launchpad.net/~openstack 
>> More help   : https://help.launchpad.net/ListHelp 
>> 
> 
> 
> 
> -- 
> Regards 
> Huang Zhiteng 



--  
Regards 
Huang Zhiteng