Direct Attached Storage
A typical Direct Attached Storage (DAS) system is made of a data storage device (for example enclosures holding a number of hard disk drives connected directly to a computer through a host bus adapter (HBA). Between those two points there is no network device (like a switch or router).
The main protocols used for DAS connections are ATA, SATA, eSATA, SCSI, SAS, USB, USB 3.0, IEEE 1394 and Fibre Channel.
Cisco UCS Manager allows you to have DAS with without the need for a SAN switch to push the zoning configuration.
The DAS configuration described assumes that the physical cables are already connected between the storage array ports and the Fabric Interconnects.
Cisco UCS 6400 Series Fabric Interconnects do not support 8 Gbps direct-attached FC connectivity (FC uplink ports or FC storage ports) without fill-pattern set to IDLE. When migrating to Cisco UCS 6400 Series Fabric Interconnects from Cisco UCS 6200 Series Fabric Interconnects, do one of the following:
Use a SAN switch between the Cisco UCS 6400 Series Fabric Interconnect and the storage array with 8 GB FC connectivity.
Upgrade the storage array to 16 GB or 32 GB FC connectivity.