San And Nas Storage Pdf

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The above extract is a small part of a comprehensive white paper from Auspex Systems. We hope you've found it thought provoking. The above mentioned pdf was an updated 2nd edition of the original guide - published a year later - in October SSD history.

SAN vs. NAS

The above extract is a small part of a comprehensive white paper from Auspex Systems. We hope you've found it thought provoking. The above mentioned pdf was an updated 2nd edition of the original guide - published a year later - in October SSD history.

Are we there yet? Editor:- although Auspex finally joined our list of dead storage companies in June this classic article below remains a lasting testament to their forward looking technical vision.

The ideas they developed about network storage architecture will continue in use long after the company itself has been forgotten. Whatever happened to Auspex's pioneering ideas about network storage?

Your local installed base memory "RAM" will be bigger than all your storage. Using the comparative power of ratios has been a helpful way during SSD history to compare and understand the impact and direction of many new design directions. The same is likely to be true for the memoryfication of future processor designs too. The SSD market is moving into a new phase at the core of which is changed thinking about the role of memory and storage and software.

Where are we heading with memory systems and software? Such expansion makes it increasingly important for IT professionals to develop comprehensive strategies designed to optimize network infrastructure with storage solutions that will enable scalability , reliability , performance , availability , affordability and manageability.

Compounding the challenge of explosive content demands, there are two major technology shifts IT professionals must consider when developing an enterprise storage strategy: first, the impact of networking technology on storage architecture and content management second, the impact of parallel processing on the design of storage products.

Auspex Storage Architecture Guide is designed to help CEOs, CIOs and network adminis-trators understand these architectures and know the best use for each, while it provides suggestions for designing an effective storage strategy for workgroup, enterprise and ebusiness. Storage standards are weak standards that are driven by component considerations.

This type of storage is alternatively called captive storage, server attached storage or direct attached storage DAS as illustrated in Figure 1. This is because storage was local to a specific server when these standards were defined and server vendors implemented variations that were not compatible.

Storage standards therefore are weak standards and driven by component considerations. In other words, the problem with storage standards is that there seems to be so many of them.

As a result of weak storage standards, third-party DAS vendors such as EMC and Compaq Corporation, need to re-qualify their products with each revision of a server's operating system software. Each interconnect often requires special host software, special firmware and complicated installation procedures. Figure 1. A strong standard for Network Attached Storage NAS In contrast, network standards are strong standards that are driven by system considerations.

There are two true network standards for accessing remote data that have been broadly implemented by virtually all UNIX and Windows NT system vendors. As a result of these broadly accepted standards for network data access, storage devices that serve data directly over a network called Network Attached Storage or NAS devices are far easier to connect and manage than DAS devices. Figure 2. Over this same period, however, the transfer rate for leading edge networking interconnects has increased tenfold from This has shifted the bottleneck from the network to the server and its direct attached storage.

These projections are based on four key factors: Strong standards for NAS result in simpler installation and lower management cost. Increased network speed can equalize the performance gap that used to exist between NAS and DAS for many applications. Trends to re-centralize storage to reduce management costs.

Scale-up - refers to architecture that uses a fixed controller resource for all processing. Scaling capacity happens by adding storage shelves up to the maximum number permitted for that controller. Scale-out - refers to architecture that doesn't rely on a single controller and scales by adding processing power coupled with additional storage.

Current confusion over NAS and SAN Server vendors have implemented a variety of specialized hardware and software schemes to encourage the sale of storage with their processors.

General-purpose DAS vendors have followed the same strategy. The vendors developed these proprietary visions to bring the benefits of NAS to their users without losing control of the storage and networking sale to NAS vendors. The SAN initiative is a loose configuration of vendors attempting to promulgate the weak standards of the past while talking about bringing the benefits of networking to storage architecture.

Easy storage resource management. Data sharing. Interoperability of heterogeneous servers and storage. Are you ready to rethink enterprise RAM? Instead of putting the storage directly on the network, the emerging SAN concept puts a network in between the storage subsystems and the server as Figure 3. SAN standards are in forma-tive stages and may not be established for years. But, leading storage vendors have announced proprietary SANs that are still largely visions.

This may create major road-blocks to successful integration and data sharing between heterogeneous platforms. The importance of parallel processing in storage subsystem design Equal in importance to the impact of networking technology on storage architecture and management is the shift to parallel-processing architectures in storage subsystem design.

Experts have noted the semiconductor industry finds it increasingly difficult to achieve faster processing speeds. To counteract this situation, storage subsystem providers are taking advantage of parallel processing designs in two ways: Designing computer nodes with multiple CPUs.

Linking multiple nodes together to act as one system. Each processor runs specialized real-time software called the DataXpress kernel. These advantages are discussed further in Chapter 5. Figure 3. This modern parallel architecture allows the Auspex NetServer to provide users with simplified scaleup of storage capacity, processors, network connections and perfor-mance.

The Network Appliance design requires all storage requests to arbitrate for a single data bus and a single processor performs all computing functions. EMC Celerra provides a degree of parallelism by clustering network adapters known as Data Movers in a separate cabinet in front of the Symmetrix storage subsystem and by removing data management functions to separate processors, known as Control Stations. Auspex is committed to providing the best possible NAS information Being the primary innovator of NAS, Auspex is widely considered by customers and analysts to have the highest level of expertise in both NAS and networking technology.

Since the topic of NAS is new to many customers, Auspex is committed to providing the best available information about optimizing these different types of storage depending for real application work-loads, cost, performance, availability and data sharing. This report contains URLs and references that identify some of the available information.

The Network Appliance design requires all storage requests to arbitrate for a single data bus and a single processor performs all computing functions All storage requests from the Celerra network adapters must arbitrate for a single redundant backplane bus in the Symmetrix storage sub-system. Drilling to the details Chapter 1 has identified trends in computing that affect network storage strategy decisions, introduced the main storage architecture options, and identified issues involved in selecting an appropriate enterprise storage solution.

Chapter 2 defines the different types of storage architecture, comparing benefits, technologies and applications. Chapter 3 provides guidelines on the best use for each storage architecture. Chapter 4 compares the subsystem architecture used by each major enterprise storage vendor. Chapter 5 discusses the benefits of implementing a parallel hardware and software design in enterprise storage strategy. Chapter 6 brings the pieces together in a conclusion designed to help CIOs and network administrators identify the best total solution for their specific enterprise storage needs.

The best total solution goes beyond selecting just the right storage architecture and product, to identifying the vendor who offers the most advanced technology, has a proven history of providing innovative enterprise storage systems and solutions, and who provides value-added service, consulting, and support.

Direct Attached Storage DAS evolved from the server industry where server vendors have traditionally sold storage as an add-on. DAS is an appropriate choice for the following: Very low end PC applications Very high-end high-performance mainframe applications Certain compute intensive and high performance OLTP database applications.

Network Attached Storage NAS evolved from the networking industry where there are strong standards for connectivity, data security and load balancing. NAS is a more mature technology and deployed in 1 of 2 enterprises today. SAN is deployed in 1 of 20 enterprises. Because of its current lack of standards SAN is available only in proprietary configurations and the long-term inter-operability of these schemes is still not apparent. Although the SAN vision involves many benefits now available on NAS, there are certain synergies with existing enterprise operational and management tools that have led early adopters to experiment with test deployments.

Although the long-term SAN vision is for inter-operability among heterogeneous servers and storage products, it is advisable to implement early SAN applications in a homogeneous environment with one of the available proprietary solutions from EMC, HDS or Compaq. SAN is also appropriate for applications that do not require true data sharing, a feature which will not likely be available until SAN standards evolve to the level of those available with NAS today.

This choice, however, has drawbacks in the areas of availability, performance, scalability, and manageability compared to products from Network Appliance, EMC and Auspex which are more suited for dedicated network file serving. Following is a brief discussion of the enterprise storage solutions available from these three vendors:. Network Appliance F Single process, single system bus The single processor, single system bus, single parity disk, RAID 4 Network Appliance F Series was designed for low-end, low-cost, non-mission critical applications for which it is an appropriate choice.

Network Appliance is likely to announce an Intel based SMP design to allow greater scalability and performance than its current product line. Application upgrade capability will be an important issue to consider when this new product is announced.

EMC Celerra: clustered network EMC's Celerra provides a clustered network file server front end to the Symmetrix storage subsystem which was originally designed for mainframe data. Celerra and Symmetrix is appropriate for co-located mainframe and open system data and for users requiring remote mirroring for disaster tolerance. The Celerra hybrid design has certain restrictions compared to Network Appliance or Auspex when it comes to NFS and CIFS data sharing and should be viewed more as partitioned storage than as an optimized file serving, data sharing product.

Auspex 4Front NS Functional Multiprocessing FMP Among available products that are specifically designed for file serving the Auspex 4Front NS Series is the only choice specifically designed for file serving that is based on a parallel processing design using integrated hardware and software.

FMP is based on a building block concept that is highly scalable and easy to expand. Click here to view the full 50 page article - a Storage Architecture Guide pdf The above mentioned pdf was an updated 2nd edition of the original guide - published a year later - in October

What is SAN (Storage Area Network)

The emergence of networked storage has allowed organizations to de-couple their server and storage purchasing decisions. This is unlike direct attached storage systems DAS where disks are connected to an application to a database server. In DAS environments, even if one only needs to add more storage, one has to also add more servers. Most of the direct attached storage systems are moving from supporting parallel SCSI protocol to supporting serial Skip to main content Skip to table of contents.

Expand your current storage pool with enterprise-grade Direct Attached Storage appliances. Video server and storage appliances built for video surveillance, access control and video analytics. Introducing the Petabyte Rack, 3. Configure a Broadberry failover cluster, powered by Windows Storage Server or Open-E's award-winning storage operating system. GPU-accelerated servers delivering massive parallel processing power and high configurability, up to 20x GPU's. Revolutionary new PC's, the power of traditional computers small enough to screw to the back of your monitor. These everyday workstations are cost-effective and highly configurable to your individual needs.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Heger Published At a first glance, SAN and NAS solutions seem almost identical, and as a matter of fact, many times either solution may be applicable in any given environment. Save to Library. Create Alert. Launch Research Feed.


This edition applies to the products in the IBM Storage Area Networks (SAN) portfolio. Note: Before using Network-attached storage (NAS) is basically a LAN-attached file server that serves files by using a de-metro-cloud-connect-​alfabia.org


What is SAN (Storage Area Network)

The differences between NAS and SAN can be seen when comparing their cabling and how they're connected to the system, as well as how other devices communicate with them. However, the two are sometimes used together to form what's known as a unified SAN. SAN and NAS technology does not require a specific computer operating system, although many of these devices use Linux under-the-hood. A dedicated hardware device that connects to a local area network, usually through an Ethernet connection. This NAS server authenticates clients and manages file operations in much the same manner as ordinary file servers, through well-established network protocols.

Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. First it is best to define the difference between a block device and filesystem. This is easier grasped if you are familiar with UNIX because it makes an objective distinction between the two things. Still the same applies to Windows.

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SAN vs NAS - Difference between a Storage Area Network and Network Attached Storage

Network-attached storage NAS is a file-level as opposed to block-level storage computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS is specialized for serving files either by its hardware, software, or configuration. Network-attached storage removes the responsibility of file serving from other servers on the network. From the mids, NAS devices began gaining popularity as a convenient method of sharing files among multiple computers. Potential benefits of dedicated network-attached storage, compared to general-purpose servers also serving files, include faster data access, easier administration, and simple configuration.

И все же Сьюзан понимала, что остановить Хейла могут только его представления о чести и честности. Она вспомнила об алгоритме Попрыгунчик. Один раз Грег Хейл уже разрушил планы АНБ. Что мешает ему сделать это еще. Но Танкадо… - размышляла.  - С какой стати такой параноик, как Танкадо, доверился столь ненадежному типу, как Хейл. Сьюзан понимала, что теперь это не имеет никакого значения.


13 Exploring the Alternatives. 13 Direct Attached Storage (DAS). 14 Storage Area Networks (SAN). 16 Network Attached Storage (NAS). 17 Ease-of-installation.


Network-attached storage

Это заявление не оставляло места обвинениям в сексуальном домогательстве, однако как-то один из старших криптографов по глупости решил проверить справедливость слов шефа. Однажды, в первый год своей работы в агентстве, Сьюзан заглянула в комнату новых криптографов за какими-то бумагами. Уже направляясь к двери, она увидела свое фото на доске объявлений и едва не лишилась чувств. На фотографии она была изображена наклонившейся над постелью, в одних трусиках. Как выяснилось, кто-то из криптографов сосканировал фотографию из порножурнала и приставил к телу головы модели голову Сьюзан.

2 Response
  1. Nika

    Build your business on the best of cloud and on-premise together with Hybrid Cloud Infrastructure solutions.

  2. Ezilda A.

    If you are managing your own infrastructure in your own private data center, then you are bound to go through a selection of different storage offerings.

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