Windows file server performance compared to Linux [closed]

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http://serverfault.com – I have been tasked with determining if we should consider migrating from a Windows Server 2008 R2 server using windows shares to a Linux based file server using samba. We would still authenticate with AD running on Server 2008 R2 and most of our computers run Windows 7. The file servers vary in storage capacity and configuration, but the primary one runs three local 4 disk raid 5 shares. All of the file servers use local disks, some SAS some SATA. Their primary usage is to store files 2-5GB in size which are pulled down by 20-30 users at a time, then copied back up when they finish their (HowTos)