San And Nas Difference Pdf


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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. Selecting a storage solution pretty much depends on your requirement. Before finalizing a particular storage option for your use case, a little bit of understanding about the technology is always helpful.

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A storage area network SAN is a dedicated, high-speed network that provides access to block-level storage. SANs were adopted to improve application availability and performance by segregating storage traffic from the rest of the LAN. SANs enable enterprises to more easily allocate and manage storage resources, achieving better efficiency.

Storage area network

These are my understandings of what they are. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often made as a computer appliance — a specialized computer built from the ground up for storing and serving files — rather than simply a general purpose computer being used for the role. SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system.

A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices. I don't know what that is or what that would look like if I saw one. Trying to research this and I don't get any hits.

Probably should warn you if you haven't figured it out already, but pretty much no one who wants to argue is going to respect wiki copypasta. If you're lucky, this won't devolve into a pure rant post. For what it's worth, for the most part I agree with the information as you've presented it, as it's pretty much how I've either experienced it, or had it explained to me as well.

The terms are all, to some degree, ambiguous. They have very specific meanings technically, and different but extremely well known accepted general use meanings. The acronyms themselves actually describe themselves to a point that additional explanation is pretty much unnecessary, in theory. It is a term for the network and nothing else. Technically this need not be block storage, but absolutely no one uses the term that way. Dedicated file level storage on a dedicated network for storage is legitimately a SAN but no one calls it that because it is so far from the accepted usage.

NAS is purely a marketing term. NAS is a word like "cloud" but for a file server. It's a soft term and should not exist. It serves no useful purpose. But appliancized file server is the best definition. But that's a silly thing to have a term for. But it has worked wonders for confusing the industry into spending way more money than necessary on simple storage. Technically what people refer to as a SAN is really just a block storage server. That's all. It's a device that serves out disk or disks or something and presents them as block storage over a network.

It should be called a block storage server. Calling it a SAN is what leads to this confusion. Yet absolutely everyone does and no one would know what to call it otherwise. Again, marketing wins. When you buy these servers they are invariably labeled SANs even though you would never buy Windows Server and expect it to be labeled a LAN - we all know the difference between a network and a node on the network.

But when used incorrectly we are left confused and new terms are introduced. If SAN refers to the device rather than the network, as people typically do, then we are left not knowing how it is attached and without the obvious terminology to ask it.

What happens is that devices often get labeled by the intended use which is crazy since nearly all devices in this range can be used in multiple ways and commonly are. So what makes things really hard is the mix of "correct" terminology with "common" usage and the obvious problems that come anytime that marketing terms are used or that technical terms are coopted for other purposes.

Just like many "cloud" discussions are hijacked by marketing and overlaid with hosted services discussions. In the end the IT Pro loses out for lack of necessary terminology to describe what they are doing. In short, a full description is necessary as no term can be used reliably anymore. There is just little getting around that. In this realm certain technologies, like SAS, are chosen seemingly at random to imply that certain devices are block storage but intended to be used without a switch or hub between them and the machine consuming the block storage.

This is a bit tough as there is no technological definition here. DASAN, likewise, is a term that came into being for the opposite problem. When a block storage server is misidentified as a SAN as they always are then we are left without the necessary term for naming the network to which it is attached and so intended use comes into play again.

So a block storage device intended to be used on a SAN gets called a SAN and when it is not used with a network but instead attached directly to the consuming device what can be call it?

It is not a DAS because actually usage does not change intended usage. TierneyColo is an IT service provider. Scott, I commend you on your excellent responses. There really is too much marketing fluff and too little functional distinction for useage in these terms. Variety in terms of network connectivity, segmentation, directory services, etc.

Nice info all Nope, certainly not just you. The terms are fuzzy and ambiguous in most cases. I can come up with fringe cases that make pretty much any standard definition useless, examples would include:. The industry term for the thing that actually has the disks, and does some magical stuff is a Disk Array. A disk array is a disk storage system which contains multiple disk drives. It is differentiated from a disk enclosure, in that an array has cache memory and advanced functionality, like RAID and virtualization.

Components of a typical disk array include: Disk array controllers Cache memories Disk enclosures Power supplies Typically a disk array provides increased availability, resiliency and maintainability by using additional, redundant components controllers, power supplies, fans, etc. Additionally those components are often hot-swappable.

Global Cache is the key feature, that todays modern hybrids have carried over into the modular space Like a VSP. Utility Storage Arrays - This is a crap marketing term that has snuck into the article that really just means, supports multi-tenancy and wide striping, someone from 3PAR marketing snuck in and put this edit in. Industry terms are often wrong, however, as they are often dreamed up by the marketing people.

The other problem with the term Disk Array, versus Block Storage Server, is that it is a name for a type of implementation, not the fundamental underpinning. Someday when disk arrays are no longer the preferred standard for storage these terms will become apparently incorrect. See, this is where I would get confused, as I always saw a "disk array attached to a network and accessed via the network as NAS network attached storage " and a SAN as the network that you talked to the NAS over.

It wasn't until I started having to work with iSCSI and AoE that I started to think about it differently, and most of that had to do with the spotty documentation I could get my hands on. Even then, I still think "Block storage" and Networked accessible File Stores would be a hell of a lot clearer than three letters than can be re-arranged to mean something completely different.

Block Storage vs. File Storage, right? Another point of haziness that I've come across is DAS. A local drive in the server chassis is direct-attached, is it not? So perhaps a direct attached array enclosure? Another way to say it is where is the network in relation to the application, the file system, and the storage device. However if the network was between the file system and the storage device you had SAN. Attached to this reply you will find a PDF file of two presentation slides that were based upon the SNIA definitions and presentations at the time.

The "artwork" was mine. I hope that these pictures are truly worth a thousand words and that they clarify the statements made above. That's correct, but only because SNIA was providing only marketing terminology and not technical.

Okay, but that's useless and we are back to square one. Now how do we define these things in real world use? That's a useless definition. These elements generally consist of an engine that implements the file services, and one or more devices, on which data is stored. What they are obviously missing is the concept of appliancization.

This is absolutely critical to the concept of a NAS. You will notice that it is usually, but not necessarily, limited to block devices. A SAN consists of a communication infrastructure, which provides physical connections, and a management layer, which organizes the connections, storage elements, and computer systems so that data transfer is secure and robust. According to this definition, an Ethernet-based network whose primary purpose is to provide access to storage elements would be considered a SAN.

SANs are sometimes also used for system interconnection in clusters. Even if you are doing routed. Nothing in a SAN makes it non-routable. That's just not common. To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks. Popular Topics in Data Storage. Which of the following retains the information it's storing when the system power is turned off? Magnus Jul 21, at UTC. Pure Capsaicin. Thank you, both Beast and Scott, this is all new to me.

Tierneycolo Jul 21, at UTC. Amechi Jul 21, at UTC.

SAN vs NAS IN 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. The hard disk drives with "NAS" in their name are functionally similar to other drives but may have different firmware, vibration tolerance, or power dissipation to make them more suitable for use in RAID arrays, which are often used in NAS implementations. In a non-RAID application, it may be important for a disk drive to go to great lengths to successfully read a problematic storage block, even if it takes several seconds.

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. To reduce the costs of standard file servers, NAS devices generally run an embedded operating system on simplified hardware and lack peripherals like a monitor or keyboard and are instead managed through a browser tool. The administrator of a home or small business network can connect one NAS device to a local area network.

These are my understandings of what they are. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often made as a computer appliance — a specialized computer built from the ground up for storing and serving files — rather than simply a general purpose computer being used for the role. SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system. A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices.


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What is SAN (Storage Area Network)

A storage area network SAN or storage network is a computer network which provides access to consolidated, block-level data storage. SANs are primarily used to access data storage devices, such as disk arrays and tape libraries from servers so that the devices appear to the operating system as direct-attached storage. Although a SAN provides only block-level access, file systems built on top of SANs do provide file-level access and are known as shared-disk file systems. Storage area networks SANs are sometimes referred to as network behind the servers [1] : 11 and historically developed out of a centralized data storage model, but with its own data network.

Неужели Стратмор каким-то образом проскользнул наверх. Разум говорил ему, что Стратмор должен быть не наверху, а внизу. Однако звук повторился, на этот раз громче.

Быть может, уже поздно. Я сожалею о Дэвиде Беккере. Она изучала записку.

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

Storage Protocols

На пальцах ничего. Резким движением Халохот развернул безжизненное тело и вскрикнул от ужаса. Перед ним был не Дэвид Беккер. Рафаэль де ла Маза, банкир из пригорода Севильи, скончался почти мгновенно. Рука его все еще сжимала пачку банкнот, пятьдесят тысяч песет, которые какой-то сумасшедший американец заплатил ему за дешевый черный пиджак. ГЛАВА 94 Мидж Милкен в крайнем раздражении стояла возле бачка с охлажденной водой у входа в комнату заседаний. Что, черт возьми, делает Фонтейн? - Смяв в кулаке бумажный стаканчик, она с силой швырнула его в бачок для мусора.

Быстрым движением Халохот подтащил его к скамье, стараясь успеть, прежде чем на спине проступят кровавые пятна. Шедшие мимо люди оборачивались, но Халохот не обращал на них внимания: еще секунда, и он исчезнет. Он ощупал пальцы жертвы, но не обнаружил никакого кольца. Еще. На пальцах ничего. Резким движением Халохот развернул безжизненное тело и вскрикнул от ужаса. Перед ним был не Дэвид Беккер.

 Сегодня годовщина Иуды Табу. У всех такие… - На ней майка с британским флагом и серьга в форме черепа в одном ухе. По выражению лица панка Беккер понял, что тот знает, о ком идет речь. Мелькнул лучик надежды. Но уже через минуту парень скривился в гримасе.

 Боже мой! - Она улыбнулась.  - Вы, американцы, совсем не умеете торговаться. На нашем рынке вы бы и дня не продержались. - Наличными, прямо сейчас, - сказал Беккер, доставая из кармана пиджака конверт.

Быстрее. Беккер повернулся и побежал, но успел сделать только один шаг. Мужчина выхватил оружие и выстрелил. Острая боль обожгла грудь Беккера и ударила в мозг.

Все, что угодно, только не шифр, не поддающийся взлому. Стратмор сурово посмотрел на. - Этот алгоритм создал один самых блестящих умов в криптографии.

4 Comments

Nicholas B.
13.05.2021 at 09:59 - Reply

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Nelly A.
20.05.2021 at 03:42 - Reply

is a dedicated network of storage devices(can include tape drives storages, raid disk arrays etc) all working together to provide an excellent block level storage. While.

Lyle L.
21.05.2021 at 05:26 - Reply

This is my answer to a question that came in via Quora :.

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