The Javelin S4 offers four bays for HDDs. Any combinations of RAID0, 1, 5 and 10 arrays are possible. You can even build a three-disk RAID5 and use a fourth disk as a replacement in case of a failure. JBOD is not supported.
When building an array, you can limit the file system size (the Javelin S4 uses XFS) which is necessary if you want to use iSCSI volumes. By default, 10% of the total storage capacity is reserved for iSCSI. You can later expand the main disk volume but won't be able to allot more storage for iSCSI. An iSCSI volume is created on an existing partition; you can specify its name and size and enable CHAP-based access.
The Javelin S4 supports RAID migration without data loss. Particularly, you can build a mirror or RAID5 out of a single disk or add a fourth disk to a three-disk RAID5. Unfortunately, you cannot replace disks sequentially with higher-capacity ones to boost the capacity of a RAID1 or RAID5 array.
The Javelin S4 connects to a LAN via a Gigabit Ethernet port. The network settings are standard: device name, IP address, Jumbo Frames on/off. An integrated DDNS client is available. Wake-on-LAN is supported.
You can create users and groups right on the NAS or integrate the latter into an Active Directory. We’ve got but basic settings here: create/delete a user or group, change a user password/group membership. The Javelin S4 supports disk quotas issued for each RAID array to individual users as well as groups.
You can access the NAS via SMB, AFP, FTP or NFS protocols which can be enabled independently of each other. A recycle bin can be turned on for SMB. AFP has no special settings at all. A NIS domain can be used for NFS. For FTP, you can specify control and passive mode ports and enable encryption. Unicode is supported for filenames.
You can create any number of folders on the NAS. By default, there are as many as seven standard folders after you format the first disk volume (PUBLIC, VIDEO and others). They cannot be removed but you can restrict user access to them protocol-wise.
Access rights to existing resources and new folders are assigned for all the protocols at once: no access, read-only, read & write. With NFS, you can specify IP addresses or their ranges that can access a folder (read-only mode can't be selected then).