Direct-attached storage (DAS) is digital storage directly attached to the computer accessing it, as opposed to storage accessed over a computer network (i.e. network-attached storage). Examples of DAS include hard drives, solid-state drives, optical disc drives, and storage on external drives. The name "DAS" is a retronym to contrast with storage area network (SAN) and network-attached storage (NAS).
DAS refers to specified storage devices directly connected to and used by servers.
DAS is classified into internal DAS and external DAS.
External DAS can be connected to servers through the FC or SCSI protocol.
See more: Differences between SCSI, ISCSI, FCP, FCoE, FCIP, NFS, CIFS, DAS, NAS, SAN
https://forum.huawei.com/enterprise/en/differences-between-scsi-iscsi-fcp-fcoe-fcip-nfs-cifs-das-nas-san/thread/229549-891