Can NetApp filers/shelfs be directly connected to Linux?

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http://serverfault.com – I have a NetApp FAS2050 which is no longer in production. It have 4 disk shelfs. So I wonder: Would it be possible to connect the disk shelfs directly to a Linux host with a LSI adapter, and then format the disks to e.g. ext4? Or does NetApp use some proprietary protocol, so the shelfs will only communicate with a NetApp filer? (HowTos)