Articles: Networking

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Basic Functionality

Disk arrays are set up after choosing the Storage Manager option in the main menu. You can also check out the status of your disks here: product model, storage capacity, firmware version, S.M.A.R.T. information and temperature. S.M.A.R.T. tests can be run manually.

The DS411slim allows using hard disks as JBOD or RAID 0, 1, 10, 5 or 6. A replacement disk can be assigned for fault-tolerant arrays. Synology’s exclusive Hybrid RAID feature can also be selected: it chooses the most reliable configuration based on the number of installed HDDs. HDDs can be scanned for errors when being combined into an array.

You can change the composition and type of your RAID without losing your data. Particularly, you can add more disks into a JBOD, transform single HDDs into a mirror or RAID5, and replace HDDs with larger-capacity ones in a RAID1, 5 or 6.

HDDs can be combined into groups (using RAID technology) and then split up into multiple disk volumes. The capacity of such volumes can be increased without losing data as long as there is free space in the group.

The DS411slim supports iSCSI technology which is usually utilized for virtualized environments. You can build iSCSI volumes as files on existing arrays or enable block access mode for new arrays.

A 2.5GB partition is allotted for the NAS's operating system. The newly installed OS takes about 500 megabytes whereas the remaining 2 gigabytes are for a swap file. There is a copy of the system partition on each disk, so the NAS will keep on working if you remove a disk out of it. The rest of the disk capacity is for user data. The default file system is ext4.

The DS411slim provides access to files via all modern protocols: SMB, AFP, NFS and FTP. Browser-based access and WebDAV are supported, too. When on a Windows network, the NAS can be added to a domain and use the latter’s database of users and user groups. A network recycle bin is available for the SMB protocol. When enabled, a “#recycle” folder appears in the root directory for restoring deleted documents. It cannot be enabled for particular resources but only for all files and folders stored on the NAS.

The AFP and NFS protocols do not have any special settings. You can only enable or disable them and specify a folder for the Time Machine utility in Mac OS X. The FTP server has a dedicated setup page with as many as three tabs. You can change its port numbers, disable unencrypted FTP, limit the number and speed of FTP connections. The FTP server supports passive mode, Unicode filenames and anonymous users (for whom special access rights can be applied).

The easiest access control method for home applications is a local database of users and user groups. But if you’ve got a lot of users, you can utilize a Windows domain or an LDAP server (there is a special software package you can install on the NAS to enable its own LDAP server). When using a local user database, you can prohibit users to change their password and specify a time limit for blocking user accounts. The DS411slim supports quotas for each disk volume.

The home folders service is required for certain functions.

Users can be prohibited to access some of the NAS's services. For example, you can allow a remote user to work with the FTP server but not with the web-based file manager or download station.

A shared folder is the basic network resource. When creating a folder, you can hide it in the network environment, allow it to be indexed by search and media services, enable Windows ACL (to assign access rights to subfolders and individual files on Windows networks). Individual folders can be encrypted. To access an encrypted folder, you have to enter a password or provide a key file (created automatically). The data-transfer speed is going to be lower with such resources. They do not support NFS and have a limitation concerning the maximum size of a file or folder name. FTP and HTTP-based access (including File Station and WebDAV with CalDAV calendars) has additional options that allow to prohibit to view, change or download files. With NFS, you can specify IP addresses, networks or hostnames that have access rights (read only or read & write).

The DS411slim also supports UPnP, Bonjour and SMNP.

The NAS connects to a network via a Gigabit Ethernet interface. It supports manual and automatic IP address setup, Jumbo Frames, IPv6 and DDNS. An integrated PPPoE client is available. A wireless interface can be implemented by plugging in a compatible USB adapter.

There are some features that help you set your DS411slim up for remote access by registering a domain name and setting up port translation on your router. The list of compatible routers includes about 200 models.

As for security features, the DS411slim has an integrated firewall. You can specify individual access rules for each network interface and service. A password guessing attempt can be identified and blocked.

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