dhis2-devs team mailing list archive

[Jason Pickering <jason.p.pickering@xxxxxxxxx>]

On Sun, Mar 13, 2011 at 2:18 PM, Jo Størset <storset@xxxxxxxxx> wrote:
> Took it off-list, but maybe others are also interested?


Oops.


> Den 13. mars 2011 kl. 10.54 skrev Jason Pickering:
>
>> Looking more into costs, it seems to be quite significant. Costs are
>> calculated based on instance-hour. If it is up and running, it is
>> billed.  Testing on a Micro instance proved that performance is pretty
>> unacceptably slow. Scaling up to an instance with 17 GB of memory
>> improved things significantly. Latency with the RDS service seems
>> significant but could be related to the relatively small size of the
>> database (5 GB). Keeping an instance up and running 24X7 for a month
>> will cost you several hundred bucks it seems, significantly more than
>> Linode.
>
> How did you go about calculating this? Linode is comparable to running EC2 without RDS, I guess, I get $ 87.84/month for a one year large reserved instance, that is

There is a cost calculator..http://calculator.s3.amazonaws.com/calc5.html

and I was reading this.

https://forums.aws.amazon.com/message.jspa?messageID=114409

>
> What - Linode - EC2
> ----
> Price - $159.95 - $ 87.84
> Memory - 4096MB - 7.5 GB
> Disk - 128GB - 850 GB
> Processing - ? - 4 EC2 Compute Units (1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor)



> It is a bit difficult to compare, but I'm not sure amazon don't make sense even for stand-alone instances. And for flexibility and services offered, especially if running >several services in coordination, it certainly seems to make sense. While a micro instance has "low" IO performance a  large instance has "high" IO performance, so >I think your latency issues might go away as well...
>
The interesting thing is that the MicroInstances with the RDS backend
actually work quite well for data entry, which is the main use case
for me considering Amazon (and various regulatory issues). I am
thinking that if we created a stripped down version of the DHIS war,
which consisted only of the stuff needed by data entry personell,
micro instances which are easily created and load balanced could serve
as a powerful way to scale up and down based on demand. This is of
course possible as well with LinNode, but it is just so easy on Amazon
to do this. I doubt going to support things like the data mart, import
and other memory hungry tasks, but it is simple to create a new
(temporary) instance which could be used for these "heavier" tasks.

> Am I missing any significant details?

I am not sure at this point. I think we need to do some testing.

>> If you want to test yourself, give me your Amazon WS customer ID, and
> I will make the AMI available to you.

Done. Obviously, there are some issues related to the RDS backend.
THis is obviously connected to my instance, which I assume you should
have no authority for. It would be nice to have a stripped down AMI
with just Tomcat and HTTP (for the reverse proxy). Might perform
better. It seems you can import virtual machines into Amazon  as well,
but have not figured out this part yet. :)

Regards,
Jason






-- 
Jason P. Pickering
email: jason.p.pickering@xxxxxxxxx
tel:+260974901293