On 26/07/17 15:38, Brian Stinson wrote:
> On Jul 26 15:04, Fabian Arrotin wrote:
>> On 25/07/17 17:45, Brian Stinson wrote:
>>> On Jul 14 16:25, Fabian Arrotin wrote:
>> <snip>
>>>
>>>
>>> A couple of us spoke about this the other day and decided that we would
>>> take the following approach to sizing VMs on altarch hardware:
>>>
>>> Our Openstack instance, CICO Cloud, has the following VM sizes
>>> available:
>>>
>>> Name | RAM | Disk | Ephemeral | VCPUs |
>>> --------+------+------+-----------+-------+
>>> tiny | 1940 | 10 | 0 | 1 |
>>> small | 3875 | 20 | 0 | 2 |
>>> medium | 7750 | 40 | 0 | 4 |
>>> --------+------+------+-----------+-------+
>>>
>>> We will duplicate the same sizes for Libvirt VMs on altarch hardware,
>>> but in order to take advantage of the incredible memory density on
>>> these machines, we'll be adding a few flavors for libvirt nodes -only-:
>>>
>>> Name | RAM | Disk | Ephemeral | VCPUs |
>>> --------------+-------+------+-----------+-------+
>>> lram.tiny | 11444 | 10 | 0 | 4 |
>>> lram.small | 15258 | 20 | 0 | 8 |
>>> xram.tiny | 22888 | 10 | 0 | 4 |
>>> xram.small | 38750 | 20 | 0 | 8 |
>>> xram.medium | 77500 | 40 | 0 | 16 |
>>> --------------+-------+------+-----------+-------+
>>>
>>> The aarch64 kit will allow: tiny,small,medium,lram.tiny,lram.small
>>> The ppc64le kit will allow: all that you see above
>>>
>>> What I'd like from you all is comments about the {l,x}ram sizing. We
>>> have enough capacity to host quite a few of these VMs. Since this is
>>> easy to change and we haven't opened this up to users yet, I'll continue
>>> working on the provisioning side with this scheme in mind.
>>>
>>> Cheers!
>>>
>>> --
>>> Brian
>>>
>>
>> Well, I don't see why we should go "insane" with the xram.* flavors.
>> Actually in CI we only serve bare-metal nodes (as while it was mentioned
>> multiple times that there is CI cloud, CI users aren't able -yet- to
>> consume those instances, but that's another story) and forr bare-metal,
>> depending on which nodes/chassis they get back, it's either 16Gb or
>> 32Gb. so my point is that we shouldn't go higher than that, at least for
>> the beginning.
>
> We can remove the medium for now, but there's nothing constraining us to
> 32G hardware either for the moment (besides what's currently deployed).
>
>>
>> I don't know when (for example) RDO will be able to test a deployment in
>> CI, but for sure they'll probably have other needs than vcpus/memory, as
>> they'll have a need for storage (and bigger than 40Gb ?)
>>
>
> Disks are another story, we could almost double the disk on the lram and
> xram flavors and still be ok capacity-wise I think, but we'll need to
> gather usage patterns down the line.
>
sounds good, if we have the capacity - might as well use it.
--
Karanbir Singh, Project Lead, The CentOS Project
+44-207-0999389 | http://www.centos.org/ | twitter.com/CentOS
GnuPG Key : http://www.karan.org/publickey.asc
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