1 / 63

NAS / SAN

NAS / SAN. NAS – N etwork A ttached S torage (Filer) SAN – S torage A rea N etwork What differentiates the two?. NAS. Network attached storage (NAS) is an adding of disk drives and PC servers to existing networks to increase storage space.

hasad-perkins
Download Presentation

NAS / SAN

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NAS / SAN NAS – Network Attached Storage (Filer) SAN – Storage Area Network What differentiates the two?

  2. NAS Network attached storage (NAS) is an adding of disk drives and PC servers to existing networks to increase storage space. NAS appliances expand storage capacity independently of the PC server and provide a simple, cost-effective solution to adding network storage. What is a NAS? What components make up a NAS? Appliance, disk storage, network connection

  3. NAS What is a NAS appliance? NAS appliances were developed as an alternative to the general-purpose server solely for file storage. They are single-purpose appliances dedicated to serving files that provide a flexible and inexpensive alternative for adding storage to the workgroup.

  4. NAS NAS appliance hardware has been streamlined by eliminating unnecessary components, which results in significant cost savings over general-purpose servers. For example, unlike a PC server, a NAS appliance has no need for a keyboard, mouse, monitor, or I/O ports.

  5. NAS NAS appliances run a highly efficient operating system, typically with built-in support for multiple networking protocols, which has been optimized for serving files on the network. Unlike traditional servers whose operating systems charge a "per seat" licensing fee for each user connected to the server, there are no licensing fees with NAS appliances.

  6. NAS How does it communicate? An appliance communicates using Network File System (NFS) for UNIX/Linux environments, Common Internet File System (CIFS) for Microsoft Windows environments, FTP, http, and other networking protocols.

  7. NAS Applications for NAS • File sharing and online storage. • Backups • Duplication of images for frequently used software configurations for distribution. • Increase online storage at particular locations for remote offices.

  8. NAS Required/Desirable Features • Compatibility with Existing Networks • Easy Installation • Intuitive Web Administration • Network Security • Cross-Platform File Sharing (Cont.)

  9. NAS Legacy cross-platform environment

  10. NAS With NAS

  11. NAS Required/Desirable Features (Cont) • Compatibility with Established Backup Policy • Improved Performance under Load • High Reliability • Portable Storage

  12. NAS Benefits • With a NAS appliance, users anywhere on the network—from corporate headquarters to remote offices—are assured of timely, reliable access to their data. • NAS provides IT managers have a cost-effective file server that is easily integrated into an existing workgroup.

  13. NAS / SAN Similarities: Both provide • optimal consolidation. • centralized data storage. • efficient file access.

  14. NAS / SAN Similarities: Both allow you to: • share storage among a number of hosts • support multiple different operating systems at the same time • separate storage from the application server.

  15. NAS / SAN Similarities: Both can • provide high data availability • ensure integrity with redundant components and redundant array of independent disks (RAID).

  16. NAS / SAN Differences: NAS and SAN represent two different storage technologies and they attach to your network in very different places.

  17. NAS NAS is a defined product that sits between your application server and your file system

  18. SAN SAN is a defined architecture that sits between a file system and an underlying physical storage It is its own network, connecting all storage and all servers.

  19. NAS NAS is network-centric. NAS provides security and performs all file and storage services through standard network protocols, using TCP/IP for data transfer, Ethernet and Gigabit Ethernet for media access, and CIFS, http, and NFS for remote file service.

  20. SAN A SAN is data-centric - a network dedicated to storage of data. Unlike NAS, a SAN is separate from the traditional LAN or messaging network. Therefore, a SAN is able to avoid standard network traffic, which often inhibits performance. SANs employ gateways, switches, and routers to facilitate data movement between heterogeneous server and storage environments.

  21. NAS / SAN NAS is file oriented SAN is SCSI block oriented NAS is simple to install (Plug and Play) SAN is complex

  22. SAN What is a SAN? A SAN consists of a dedicated network that interconnects servers and their applications to storage resources with the use a switch or hub. (Hubs seldom seen any more.) Storage resources usually consists of disks and tapes. The dedicated network is usually fibre channel or iSCSI

  23. SAN An adapter card on the server is connected by fiber optic or copper cabling to a SAN switch. Disk arrays and tape devices are also connected to the switch, which brings all servers and storage devices into a peer-to-peer network.

  24. SAN

  25. NAS

  26. NAS

  27. NAS

  28. NAS

  29. SAN

  30. SAN

  31. SAN How can SAN accommodate a mixed computing environment (UNIX, WINDOWS, NOVELL)? Through a technique called zoning.

  32. SAN

  33. SAN A method of subdividing a storage area network into disjoint zones, or subsets of nodes on the network. Storage area network nodes outside a zone are invisible to nodes within the zone. Moreover, with switched SANs, traffic within each zone may be physically isolated from traffic outside the zone.

  34. SAN What type of network access does SAN employ? Fibre channel iSCSI Infiniband CIM (Common Information Model) Bluefin (based on CIM)

  35. Fibre Channel What is fibre channel? Fibre channel is a high performance serial link supporting its own, as well as higher level protocols such as the FDDI, SCSI, HIPPI and IPI It is neither a fiber or a channel. Fibre Channel is the general name of an integrated set of standards developed by the American National Standards Institute (ANSI).

  36. Fibre Channel What is a channel? There are two basic types of data communication between processors and between processors and peripherials: channels and networks. A channel provides a direct or switched point-to-point connection between the communicating devices. A channel is typically hardware-intensive and transports data at the high speed with low overhead. .

  37. Fibre Channel A network is an aggregation of distributed nodes (like workstations, file servers or peripherials) with it's own protocol that supports interaction among these nodes.

  38. Fibre Channel A network is an aggregation of distributed nodes (like workstations, file servers or peripherials) with it's own protocol that supports interaction among these nodes. Networks can handle a more extensive range of tasks than channels as they operate in an environment of unanticipated connections, while channels operate amongst only a few devices with predefined addresses.

  39. Fibre Channel Fibre Channel attempts to combine the best of these two methods of communication into a new I/O interface that meets the needs of channel users and also network users. It allows for an active intelligent interconnection scheme, called a Fabric, to connect devices.

  40. Fibre Channel In Fibre Channel terms the switch connecting the devices is called Fabric. The link is the two unidirectional fibres transmitting to opposite directions with their associated transmitter and receiver. Each fibre is attached to a transmitter of a port at one end and a receiver of another port at the other end.

  41. Fibre Channel When a Fabric is present in the configuration, the fibre may attach to a node port (N_Port) and to a port of the Fabric (F_Port).

  42. Fibre Channel FC is structured as a set of hierarchical functions.

  43. Fibre Channel The lowest level (FC-0) defines the physical link in the system, including the fibre, connectors, optical and electrical parameters for a variety of data rates. (133 Mbit/s, 266 Mbit/s, 530 Mbit/s, and 1 Gbits/s) and on three types of both electrical and optical media. The system bit error rate (BER) at the supported media and speeds is less than 10exp-12 [1].

  44. Fibre Channel FC-1 defines the transmission protocol including serial encoding and decoding rules, special characters and error control. The information transmitted over a fibre is encoded 8 bits at a time into a 10 bit Transmission Character.

  45. Fibre Channel The Signaling Protocol (FC-2) level serves as the transport mechanism of Fibre Channel. The framing rules of the data to be transferred between ports, the different mechanisms for controlling the three service classes and the means of managing the sequence of a data transfer are defined by FC-2. To aid in the transport of data across the link, the following building blocks are defined by the standard: • Ordered Set • Frame • Sequence • Exchange • Protocol

  46. Fibre Channel The Frame Header is used to control link applications, control device protocol transfers, and detect missing or out of order Frames. An optional header may contain further link control information.

  47. Fibre Channel A maximum 2112 byte long field (payload) contains the information to be transferred from a source N_Port to a destination N_Port.

  48. Fibre Channel To ensure efficient transmission of different types of traffic, FC defines three classes of service. Class 1 is a service which provides dedicated connections, in effect providing the equivalent of a dedicated physical connection. Once established, a Class 1 connection is retained and guaranteed by the Fabric. This service guarantees the maximum bandwidth between two N_Ports, so this is the best for sustained, high throughput transactions. In Class 1, Frames are delivered to the destination Port in the same order as they are transmitted. Figure 5 shows the flow control management of a Class 1 connection.

  49. Fibre Channel

  50. Fibre Channel Class 2 is a Frame-switched, connectionless service that allows bandwidth to be shared by multiplexing Frames from multiple sources onto the same channel or channels. The Fabric may not guarantee the order of the delivery and Frames may be delivered out of order. If delivery cannot be made due to congestion, a Busy frame is returned and the sender tries again.

More Related