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Re: Some insight into the number of instances Nova needs to spin up...


Actually it was 1M hosts and  Ivthink 45 million vms.  It was meant to
be across all regions.  Jason Seats set the number arbitrarily, but it
is a good target to not let us forget about scaling while we design.

I think eventually all loads will be more ephemeral.  So, I think I
agree with your numbers, if you are talking about a single availability

On 12/30/2010 11:25 AM, Erik Carlin wrote:
> You are right.  The 1M number was VMs not hosts.  At least, that was from
> one scale discussion we had within Rackspace.  I'm not sure what the
> "official" nova target limits are and I can't find anything on launchpad
> that defines it.  If there is something, could someone please send me a
> link.
> I'm am certain that Google can manage more than 10K physical servers per
> DC. Rackspace does this today.
> If I combine what I know about EC2 and Cloud Servers, I would set the ROM
> scale targets as:
> 1M VMs
> 50K hosts
> 500K transactions/day (create/delete server, list servers, resize server,
> etc. - granted, some are more expensive than others)
> That works out to ~21K/hr but it won't be evenly distributed.  To allow
> for peak, I would say something like 75K/hour or ~21/sec.
> Thoughts?
> Erik
> On 12/30/10 9:20 AM, "Pete Zaitcev" <zaitcev@xxxxxxxxxx> wrote:
>> On Wed, 29 Dec 2010 19:27:09 +0000
>> Erik Carlin <erik.carlin@xxxxxxxxxxxxx> wrote:
>>> The 1M host limit still seems reasonable to me. []
>> In my opinion, such numbers are completely out of whack. Google's Chubby
>> article says that the busiest Chubby has 90,000 clients (not hosts!) and
>> the biggest datacenter has 10,000 systems. They found such numbers
>> pushing the border of unmanageable. Granted they did not use
>> virtualization, but we're talking the number of boxes in both cases.
>> So to reach 1M hosts in a Nova instance you have to have it manage
>> 100 datacenters. There are going to be calls for federation of Novas
>> long before this number is reached.
>> Sustaining a high flap rate is a worthy goal and will have an
>> important practical impact. And having realistic sizing ideas is
>> going to help it.
>> -- Pete
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