what is SAN ?
A storage area network (SAN) is defined as a set of interconnected devices (e.g. disks and tapes) and servers that are connected to a common communication and data transfer infrastructure such as a fibre channel. The common communication and data transfer mechanism for a given deployment is commonly known as the storage fabric. The purpose of the SAN is to allow multiple servers access to a pool of storage in which any server can potentially access any storage unit.
What is software RAID Levels do?
|Redundant Arrays of Independent Disks (RAID) is formally defined as a method to store data on any type of disk medium.
What are the benefits of fibre channel SANs?
|Fibre Channel SANs are the de facto standard for storage networking in the corporate data center because they provide exceptional reliability, scalability, consolidation, and performance. Fibre Channel SANs provide significant advantages over direct-attached storage through improved storage utilization, higher data availability, reduced management costs, and highly scalable capacity and performance.
How is a SAN managed?
|There are many management software’s used for managing SAN’s to name a few:
IBM Tivoli Storage Manager.
How long has fibre channel been around?
|Development started in 1988, ANSI standard approval occurred in 1994, and large deployments began in 1998. Fibre Channel is a mature, safe, and widely deployed solution for high-speed (1 GB, 2 GB, 4 GB) communications and is the foundation for the majority of SAN installations throughout the world.
What environment is most suitable for fibre channel SANs?
|Typically, Fibre Channel SANs are most suitable for large data centers running business-critical data, as well as applications that require high-bandwidth performance such as medical imaging, streaming media, and large databases. Fibre Channel SAN solutions can easily scale to meet the most demanding performance and availability requirements.
Name some of the SAN topologies ?
|Point-to-point, arbitrated loop, and switched fabric topologies.
What is disk array?
|Set of high performance storage disks that can store several terabytes of data. Single disk array can support multiple points of connection to the network.
What are the advantages of RAID?
Redundant Array of Inexpensive Disks”
Depending on how we configure the array, we can have the
- data mirrored [RAID 1] (duplicate copies on separate drives)
- striped [RAID 0] (interleaved across several drives), or
- parity protected [RAID 5](extra data written to identify errors).
These can be used in combination to deliver the balance of performance and reliability that the user requires.
What is a HBA?
|Host bus adapters (HBAs) are needed to connect the server (host) to the storage.