why to upgrade server from small to medium in amazon

Upgradation of servers from m1.small to m1.medium or large instances :

We are using the small instance. But it is not capable to run more apps. It is capable to run upto 15 to 20 apps. So we have to upgrade the hardware of small instance. So after small instances there is medium instances are there. So we have to upgrade m1.small to m1.medium instance.

2xm1.small = 1 m1.medium . so we can deploy up to 40 to 45 apps in medium instance.

Upgradation :

• If we upgrade from current small instance to medium instance, there is chances to data loss. So avoid data loss first save the entire server as image and save that image in s3 bucket. Then boot the new m1.medium instance from the saved image.
• At the time of saving image we have to stop all the services and then save the image.
• It takes nearly 1 to 2 hours for saving the image. (down time)
• From that image we can boot the new instance.
• New instance having the new ip.
• So After launching the new instance we can make some changes in proxy, firewall, mail relay, name resolution, monitoring and maybe something else, I don't remember-- they need to get the new ip.
• And then shut down the old small instance.

Billing for medium instance :

Small instance $0.090 Per/Hour

Medium instance $0.180 Per/Hour

For 1 small instance monthly bill is $64.8 per/month

For 1 medium instance monthly bill is $129.6 per/month