Server Spec Suggestion

1 Apache server can be smaller.
1.1 RAM: Even 1GB RAM will work.
1.2 Disk: if you have tons of pictures, I would suggest you can get smaller disks and more disk quantity. For example, 36GB X 4. With RAID1, total usable size would be 36G X 2. I think that’s enough for Apache server.
1.2.1 Disk1: OS and Apache server
1.2.2 Disk2: all data
1.3 CPU: Single CPU will work
2 DB server should be bigger
2.1 RAM: 2-4 GB, depends on how fast you want and MySQL’s limitation.
2.2 Disk: the more the better (RAID1 is MUST). My minimum suggestion:
2.2.1 Disk1: System
2.2.2 Disk2: Data & INDEX
2.2.3 Disk3: Transaction Log and Backup files
2.3 CPU: suggest 2 CPUs.