Mounting File Systems (Linux)

NFS

Before installing the NFS client, please confirm that you are using the recommended kernel version according to the information in the Linux NFS client kernel defect section, otherwise the host may experience IO freezes.

If it is a CentOS host, execute the following command to install the NFS client:
```
 sudo yum install nfs-utils
```
If it is an Ubuntu host, execute the following command to install the NFS client:
```
 sudo apt-get install nfs-common
```
Since the NFS client defaults to limit the number of concurrent NFS requests that can be initiated, and the default allowed concurrent request number is 2, which has a major impact on performance, you can refer to how to modify the concurrent number of NFS requests? to modify it to improve performance.

Parameter/Option Name	Description
Mount Point	The entry point for accessing the file system. The UFS mount point is represented by an IPv4 address.
rsize,wsize	It is used to specify the block size of data when interacting with the file storage server (in Bytes). It is recommended to set 1048576.
hard	It instructs the NFS client to continue retrying operations to the remote file storage when it is temporarily unavailable, rather than returning an error to the upper layer application. It is recommended to enable this option, which can enhance the fault tolerance of long-running tasks and high-cost interruption operations to temporary failures on network and other aspects.
timeo	The time that the NFS client waits before retrying the request to the remote file storage, in units of 0.1 seconds. It is recommended to set the value to 600.
retrans	The number of retries of a request by the NFS client. It is recommended to set this to 2.
noresvport	Use a new port during network interruption reconnection, which can reduce the probability of reconnection failure. It is recommended to enable it.

After the mount command is executed, you can list the current mounted file system list by executing mount -l or nfsstat -m. If the list contains the file system to be mounted, then the mounting is successful.

We can implement automatic mounting of NFS file systems by configuring the /etc/fstab file in the Linux system. v4 protocol automatic mounting

 10.8.0.1:/ /mnt nfs rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,_netdev,noresvport 0 0

v3 protocol automatic mounting

 10.8.0.1:/ /mnt nfs rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,nfsvers=3,proto=tcp,mountproto=tcp,nolock,noacl,_netdev,noresvport 0 0

Parameter/Option Name	Description
_netdev	Indicates that the file system to be mounted is a network file system, to prevent from mounting operation before the network is ready, which may cause the host to freeze when booting up.
0 (first item after noresvport)	If the value is not 0, it indicates that the file system should be backed up by dump. For NAS service, this item is 0.
0 (second item after noresvport)	Indicates whether to perform the fsck operation after booting. Since the UFS product guarantees data persistence and consistency by the server, it is not necessary to enable this option.

Please operate according to the mount point information displayed in the “Manage Mount Point” operation. The following shows the mounting operation with the file system ID ufs-dh6tds as an example, assuming its mount point IP is 10.8.0.1 (please replace the relevant parameters in the example with the file system ID and mount point IP you want to use during actual operation).
```
 sudo mount -t cifs  -o guest,uid=0,gid=0,rsize=1048576,wsize=1048576 //10.8.0.1/share /mnt
```

Parameter/Option Name	Description
guest	Only supports client mounting based on the ntlm authentication protocol
rsize,wsize	It is used to specify the block size of data when interacting with the file storage server (in Bytes). It is recommended to set 1048576.
uid	The owner of the file after a successful mount. If uid is not set, uid will default to 0.
gid	The group to which the file belongs after a successful mount. If gid is not set, gid will default to 0.

After the mount command is executed, you can list the current mounted file system list by executing mount -l. If the list contains the file system to be mounted, then the mounting is successful.

We can implement automatic mounting of SMB file systems by configuring the /etc/fstab file in the Linux system.
```
 //10.8.0.1/share /mnt cifs guest,uid=0,gid=0,rsize=1048576,wsize=1048576 0 0
```