NAS is shared storage on a network infrastructure.
Clients Application Server Print Server NAS Device NAS Head Storage
General Purpose Servers vs. NAS Devices Network Operating System I/O File System Print Drivers Applications General Purpose Server (NT or Unix Server) Network Operating System File System Single Function Device (NAS Server)
Used to physically identify a port or node within the SAN.
Similar to NIC MAC address
Additionally, each node is assigned a unique port ID (address) within the SAN
Used to communicate between nodes within the SAN
Similar in functionality to an IP address on a NIC.
World Wide Names: Example World Wide Name - HBA 1 0 0 0 0 0 0 0 c 9 2 0 d c 4 0 Reserved 12 bits Company OUI 24 bits Company Specific 24 bits World Wide Name – Array 5 0 0 6 0 1 6 0 0 0 6 0 0 1 B 2 0101 0000 0000 0110 0000 0001 0110 0000 0000 0000 0110 0000 0000 0001 1011 0010 Company ID 24 bits Port Model seed 32 bits
Upon completion of this lesson, you will be able to:
Describe how data gets stored in a CAS environment.
Describe how data is retrieved from a CAS environment.
How CAS Stores a Data Object Application Server Client CAS API Object ID Client presents data to API to be archived 1 Unique Content Address is calculated 2 Object is sent to CAS via CAS API over IP 3 CAS authenticates the Content Address and stores the object 4 Acknowledgement returned to application 5 Object-ID is retained and stored for future use 6
How CAS Retrieves a Data Object Application Server Client CAS Object is needed by an application 1 CAS authenticates the request and delivers the object 4 Application finds Content Address of object to be retrieved 2 Retrieval request is sent to the CAS via CAS API over IP 3 API Object ID