Supported Protocols; Cifs - Fujitsu ETERNUS DX S5 Series Design Manual

4. NAS Functions

Supported Protocols

Supported Protocols
The ETERNUS DX supports Common Internet File System (CIFS), a file sharing protocol for Windows, and NFS, a
file sharing protocol for UNIX/Linux. In addition to CIFS and NFS, the ETERNUS DX supports FTP/FXP.
NAS protocols other than CIFS, NFS, and FTP/FXP are not supported.
The CIFS protocol service for the ETERNUS DX is realized by using Samba software.
CIFS and NFS are client/server protocols that can perform file management such as exclusive control on the NAS
side, which allows exclusive control over each file and simultaneous access. A file sharing environment with
different OSs, such as Windows and UNIX/Linux, can be configured.

CIFS

The CIFS is a protocol that is used for file sharing in Windows system environments.
Files on the network can be shared.
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SMB Version
The ETERNUS DX supports access from a Windows client using SMB1.0, SMB2.0, SMB2.1, SMB3.0, SMB3.0.2, or
SMB3.1.1 protocol.
In addition, the following SMB functions are supported.
• SMB2.1 Large MTU
SMB2.1 Unbuffered Handle
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• SMB3.0 Large MTU
• SMB3.0 Encryption
The ETERNUS DX connects to Windows clients by using an SMB version that supports the protocol used by the
Windows client for access.
When the SMB version is changed due to a controller firmware update on the ETERNUS DX, the change takes
effect after the session is re-established.
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Symbolic Link
Creating and using symbolic links that are supported by SMB2.0, for directories/files in any shared folder
(network drive) on the ETERNUS DX are available from the directories/files on the NTFS file system of the
Windows client.
In addition, for shared folders created in shared CIFS/NFS environment, referencing and using the symbolic link
for directories and files created by UNIX client from the Windows client are available.
Note that symbolic links between shared folders (network drives) are not supported (cannot be used from the
Windows client).
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SMB Encryption
The ETERNUS DX provides a function to encrypt data communicated using SMB3.0 with an SMB protocol base.
SMB Encryption is a function that encrypts file access communication but not the actual files.
SMB encryption can be enabled or disabled with ETERNUS Web GUI or ETERNUS CLI. Encryption is enabled for
sessions that are established after enabling the encryption setting.
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Large MTU
The Maximum Transmission Unit (MTU) for communication using SMB3.0 can be extended from 64KB to
1,024KB. This enables effective utilization of the network bandwidth.
Large MTU is automatically enabled for communications that use SMB3.0. Changing the enable/disable setting
is not possible.
161 Design Guide