USING SANS AND NAS PDF
Both SAN and NAS technologies were developed to help organizations acquired by organizations with investments in Intel servers and with data stored using. Data is the lifeblood of modern business, and modern data centers have extremely demanding requirements for size, speed, and reliability. Storage Area . NAS solutions use TCP/IP and NFS/CIFS/HTTP based networks. • SAN solutions utilizes Fibre Channel encapsulated SCSI setups. TCP/IP LAN. SAN Topology.
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systems. NAS is the highest layer of storage and can be built on top of a SAN or DAS . That's important, especially inside a storage array with 15 hard drives. both SANs and NAS play vital roles in today's enterprises and provide many advan- time and disruption associated with server-attached storage upgrades. Demystifying DAS, SAN, NAS, NAS Gateways, Fibre Channel, and iSCSI. Page 2 NAS is optimized for ease-of-management and file sharing using lower-cost.
But accessing your data by addressing the sector number while not very complex, it's an error prone method and you have to keep track yourself of the data you write and the sectors you have written to.
This explains the difference between a block device and a filesystem, a filesystem must reside on a block device. Hard disk drives need to communicate somehow, and they need to use a well defined physical interface and protocol in order for your computer to understand them, the most common interface and protocol employed today for PC is the S-ATA or Serial ATA or Serial Advanced Technology Attachment.
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And unless you access your disk by block numbers you need a file system on top of it in order to put it at good use. NAS But what if you can provide access to your file-system to other computers for transferring files? What they do is share files over a network, of course file implies an underlying file-system structure and file-system implies block device, but because it's done over a network it's called as NAS - Network Attached Storage. All of this interfaces explicitly prohibit remote lookups of block addresses for security reasons first and normally such interfaces are not even implemented.
The benefits of this approach include: Greater data reliability. Data can still be accessed if one drive or a number of drives fail.
Faster access. Files can be reassembled from the blocks closest to the user and don't need to pass through a hierarchy of folders.
With object storage, all files or objects are put into a single, enormous data pool or flat database. Files are found based on the metadata that is already associated with the file or added by the object storage OS.
Object storage has been the slowest of the three methods and is mainly used for cloud file storage. But recent advances in the way metadata is accessed and increased use of speedy flash drives have narrowed the speed gap among object, file and block storage. NAS is reflected in how each type of storage appears to the user. A NAS system or device is attached to a network via a standard Ethernet connection, so it appears to users like any other network-connected device.
The user connects to the NAS to access files on it.
The NAS device has an OS that manages the writing and reading of any data the user's computer requests. Once it has been mounted on a user's computer, a SAN will appear as a local drive. That means it will function as a local drive, and the OS on the user's computer will handle the commands to read or write data. This enables the user to treat it like any other local drive, including the ability to install software onto it. SAN vs. This gives the NAS system a direct connection to the network, generally using an Ethernet cable connected to an Ethernet switch.
Ethernet and fabric have competed on the basis of speed for years. Metadata in a NAS system is hierarchical and readable. Users can use a simple file system browser to see file names and organize them into easily named folders. With NAS, users can collaborate and share data, regardless of where they're located.
NAS makes it easy to access files and folders from any network-connected device.
NAS devices consolidate storage in one place and support data management and protection tasks, such as archiving, backup and cloud storage. And NAS can handle unstructured data, such as audio, video, websites, text files and Microsoft Office documents. NAS appliances can be outfitted with more or larger disks to expand storage capacity.
This approach is referred to as scale-up NAS. All normal hard disks, tape drives etc uses SCSI. In the beginning the storage needs of a server was fulfilled by a storage devices that was included inside the server the server used to talk to those internal storage device, using SCSI.
This is very much similar to how a normal desktop talks to its internal hard disk. The main advantage of SCSI for connecting devices to a server was its high throughput.
Although this architecture is sufficient for low end requirements, there are few limitations like the below mentioned ones. The server can only access data on the devices, which are directly attached to it. If something happens to the server, access to data will fail because the storage device is part of the server and is attached to it using SCSI There is a limit in the number of storage devices the server can access. In case the server needs more storage space, there will be no more space that can be attached, as the SCSI bus can accommodate only a finite number of devices.
An In-Depth Guide to the Differences Between SAN and NAS
Also the server using the SCSI storage has to be near the storage device because parallel SCSI, which is the normal implementation in most computer's and servers, has some distance limitations. It can work up to 25 meters. Low complexity, Low investment, Simplicity in deployment caused DAS to be adopted by many for normal requirement's.
The solution was good even performance wise, if used with faster mediums like fiber channel. Internally the storage device can use RAID which normally is the case or anything to provide storage volumes to servers. Although DAS is good for normal needs and gives good performance, there are limitations like the number of servers that can access it. Storage device, or say DAS storage has to be near to the server in the same rack or within the limits of the accepted distance of the medium used.
It can be argued that, directly attached storage DAS is faster than any other storage methods.
This is because it does not involve any overhead of data transfer over the network all data transfer occurs on a dedicated connection between the server and the storage device. However due to latest improvement's in fiber channel and other caching mechanism's, SAN also provides better speed's similar to DAS, and in some cases, it surpasses the speed provided by a DAS.
Before getting inside SAN, let's understand several media types and methods that are used to interconnect storage devices when i say storage devices, please dont consider it as one single hard disk. Take it as an array of disk's, probably in some RAID level.SCSI is nothing but a standard used to communicate between servers and storage devices.
The solution was good even performance wise, if used with faster mediums like fiber channel. This NAS server authenticates clients and manages file operations in much the same manner as traditional file servers, through well-established network protocols.
The user connects to the NAS to access files on it. SAN vs.
With the emergence of fiber channel switches from variety of major vendors, connecting many large number of storage devices and servers have now become an easy task provided you have the budget to invest. The server partitions and formats those blocks—typically with a file system—so that it can store data on the LUN just as it would on local disk storage.
I agree to my information being processed by TechTarget and its Partners to contact me via phone, email, or other means regarding information relevant to my professional interests. That File System guarantees the data consistency Storage Area Network Storage Area Network is a special type of network that connects computers and disk devices; in the same way as SCSI cables connect disk devices to one computer.
As a result, the clear divide between SAN being used with block storage and NAS with file storage is becoming blurred.
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