SAN storage

At the age of information-centric society, it extends from home to the office, from the small office/home office (SOHO) to the remote office/branch office (ROBO), small/medium-size businesses (SMB), small/medium enterprises (SME), to ultra-large organizations or enterprises.At the same time the organizations are growing, there are a lot of information and data.Nowadays, organization data and application data are kept in device. It’s called as Storage Device as IT term. Storage devices and their features become the most important parts in IT industry.‍‍‍‍
At Data center, the storage devices are used to keep application data, information data and sensitive data. In IT platform, there are Compute, Storage and Network. Applications are run on the compute node, but they can’t run if there is no connection with storage. So, storage operates as one of the most important roles in IT industry.‍‍‍‍‍‍
There are three kinds of storage: 
1️⃣ Directly Attached Storage (DAS), 
2️⃣ Network Attached Storage (NAS), 
3️⃣ Storage Area Network (SAN).‍‍‍‍‍‍
SAN is a high-speed network of storage device that also connects those storage devices with servers. It provides block-level storage that can be accessed by the applications running on any network servers. Secured high-speed data transfers network that provides access to consolidated block-level storage,is called the SAN-Storage.‍‍‍‍‍‍
Fiber Channel, ISCSI, NFS are the main protocols which are used for SAN connections.
The main functions of a storage area network (SAN) includes the following:
 A high-speed network of storage devices.
 Connects the storage devices with servers.
 Can be accessed by applications on networked servers.
 Particularly helpful in backup and disaster recovery.
 SAN can also simplify some management tasks.
 Offers flexibility, availability and performance.‍‍‍‍‍‍
Organizations often choose to deploy a storage area network because it offers better flexibility, availability and performance than direct-attached storage (DAS). Because a SAN removes storage from the servers and consolidates it in a place where it can be accessed by any application, it tends to be improved storage utilization. Storage utilization improvements often allow organizations to defer purchases of additional storage hardware, which saves money and only required less space in the data center. SAN often provides better performance than DAS. Also, because SANs usually offer multiple connections to and from the data center’s servers, they also improve availability. In addition, separating the storage from the servers free up the computing resources on the servers for other tasks not related to storage.‍‍
Storage Devices are combined with a lot of hard disks. After combining many hard disks, storage became amount such as 10 TB, 12 TB it’s called storage device and so on. There are many types of storage disk types; SAS, SSD, NN-SAS. The comparisons and limitations are based on the disk type. Now, most of organizations use SSD type. Because, SSD (ALL Flash) types are good in performance. An SSD has access speeds of 35 to 100 microseconds, which is nearly 100 times faster. This fast access speed means programs can run more quickly, which is very significant, especially for programs that access large amounts of data often like your operating system. A typical HDD takes about 5,000 to 10,000 microseconds to access data.‍‍‍‍‍‍
In the next content, we will share about how to keep(store) data ,suitable disk type for storage and how to make backup.

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