Due to the development of computer technologies and the increasing use of computers, business and personal data are stored in digital environments. When we want to keep this data, we have three solutions.
-DAS (Direct Attached Storage) solutions:
Products offering this solution can only connect to one server. We can see them as additional hard drives installed in our systems. These products connect to our servers via SCSI or SAS controllers. The main disadvantage of these products is that they cannot be shared by other servers.
-Network Attached Storage (NAS) solution:
These products are file servers that we connect to our network and have specially designed patented operating systems. These servers may contain one or more file communication protocols. The NFS and CIFS protocols are the main ones. In addition, operating systems installed on these servers provide more efficient I / O management than other operating systems. To provide additional capacity for these products, DAS units can be connected to SC devices or SAS controllers via Fiber Channel host bus adapters to which SAN devices will be explained below.
-Storage Area Network (SAN) solution:
Our servers can connect to products offering this solution using Fiber Channel and iSCSI technologies. In addition to the storage unit, Fiber Channel technology requires additional hardware called SAN fiber switch and host bus adapter, which allows the connection between our servers and the switch. In the iSCSI solution, our existing network can be used. SAN products include products that use both technologies, as well as products that use only Fiber Channel or iSCSI technologies.
SAS, SATA, or SCSI disk drives are used in products that use the SAN solution at the base level. For higher-level products, faster Fiber Channel or FATA drives are preferred. Products that support both disk structures as well as products that support only FC disks are available.
Benefits of Data Storage Solutions:
Provide the required storage space:
Availability: SAN solutions offer more usability time than other solutions. With the implementation of this solution, data entry problems in the institutions are minimized and the loss of labor can be avoided as much as possible. The cost of an hour of loss of work for the institution can vary from one institution to another and can represent billions of dollars or thousands of dollars. The value of prestige losses that may occur outside working hours can reach rates that cannot be measured with money.
Performance: These types of products are designed to optimize performance. For example, even though the number of disks that you can install on a server is limited, you can add more disks to these products, which allows you to achieve the performance required for applications that require high performance.
Efficient capacity utilization: SAN solutions can use capacity more efficiently than DAS solutions. Disks installed in a DAS unit can only be used by the server to which it is connected. Disks installed in a SAN unit can be shared by all servers connected to this SAN environment. In this way, inactive abilities are avoided.
Backup: Backup capabilities are enhanced in SAN environments. Snapshots of existing data can be taken, data replication can be provided by a storage located in a remote region, ensuring that all of our data is available and available in a remote location in the event of a disaster.
Business continuity: With the SAN solution, we have ensured that our data can be used continuously. So, what do we do if there is a problem with the operating system or the application of our running server? How long will it take to reinstall the operating system, install the necessary patches, and install the application running on it? If standard procedures are followed and everything goes well, there will be a loss of work of at least 3-4 hours. What happens in the event of a hardware failure and if the hardware to be replaced is unavailable for a few days? What loss of work will we have? In order to get rid of these negative situations, cluster structures are being established and we will continue to conduct transactions from our second server, even if a server is disabled. In order to establish such structures, the SAN structure must be created. In addition, in some cluster solutions, both servers can be used concurrently and the workload is distributed among these servers to provide more performance for our servers.
Virtualizations with SAN: Many organizations now use their physical machines on virtual machines. In order to provide high availability in virtualization solutions, we need to be installed in a cluster structure and we need a common storage space. The SAN environment will provide us with this opportunity. So, what virtualization will we provide?
This will allow us to use our existing servers more efficiently. Depending on the configuration and requirements, 10 servers can easily run on a dual-processor server with 32 GB of memory.
This will provide a benefit over license costs. If you purchase a Windows 2003 or 2008 Enterprise license according to the Microsoft licensing model, you can use 4 virtual machines with the same license.
Business continuity: In virtualization solutions built with VMware ESX, you can move and manage your virtual servers to another physical environment without interruption when you plan to manage your physical servers. All your virtual servers are clustered with high availability technology. If your server crashes unexpectedly, your other virtual machines will start running on the other server. In our tests, customers communicated with the Exchange server within 2.5 minutes.