Has a concept called filers which is a type of disk storage device which owns and controls
the file system and presents files and directories over a n/w, typically LAN.
No need for block storage – hence no need for Storage Area network with FC protocol.
Netapp now supports iSCSI, FC and FCoE
The filers use NetApp’s proprietary operating system called Data ONTAP which includes code
borrowed from Berkeley Net/2 BSD Unix.
Each Filer has a proprietary NVRAM adapter to log all writes for performance and to play the
data log forward in the event of an unplanned shutdown.
When used for file storage, Data ONTAP acts as an NFS server and/or a CIFS server, serving
files to both Unix-like clients and to Microsoft Windows clients from the same file systems.
WAFL, as a robust versioning filesystem, provides snapshots, which allow end-users to see
earlier versions of files in the file system. Snapshots appear in a hidden directory:
~snapshot for Windows (CIFS) or .snapshot for Unix (NFS).d.getElementsByTagName(‘head’).appendChild(s);