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Don't forget time to spec servers, install the OS/Apps/Backup system, configure, test, drive to the datacenter, install the kit, document it. Also you will need to spend time setting up an account with a rackspace provider and arranging all the DNS, public IPs, any necessary firewalls, etc. Also, server warranties, UPSs and the sheer hassle of specifying, ordering configuring servers and taking them to somewhere and fiddling with them and regularly patching them and so on. And increasing the storage capacity on each machine can be done at the price of $0.1/GB No it can't, you need to pay a competent admin to go to the servers, shut them down, install new drives, and start them up again and expand the RAID onto them. 1hr minimum. Assuming the RAID is expandable and there is physical space in the server - if you need to add more mounted disks the app must be adjusted to support that. If there is no space, you may need to replace some drives and handle moving the data onto them (several hours?), or worse buy a new extra server. Assuming your backup system can just take another TB of data without any changes. And what if something does go wrong? You're talking of at least half a day from the time you find out until you get someone to go, wait for the travel time, diagnose and repair and restart, then dealing with problem reports and complaints. I hope Amazon has better monitoring on S3 than anything I have set up as well. |