We are in final stages to sign a contract with our clients for OpenERP services deployment, but we need some information related to hardware, we have not enough information about it. They have estimated 5 servers for their new set-up, which i think are more than needed. They want to build 2 Application Servers, 2 Db Servers (1 for backup), and one web server (for their own web related projects)
MY QUESTIONS
1: What are the benefits of keeping 2 ERP Application servers?
2: Instead of 2 Db servers , we can have 1 Db Server. We can use Backup drives for backups, is it good idea?
3: What will be good estimate?