Once upon a time, RAID has great appeal to the user, the user is useful, but that does not mean that it is the user needs, and now users need better technology.
Disk capacity is no longer expensive
RAID can improve disk performance and, more importantly, in the case of disk failure, data protection, and ensure system reliability. However, since the invention of RAID technology, the world has undergone fundamental changes. Some storage systems are now on the RAID technology to minimize the use of, even some systems have completely abandoned the RAID.
When the initial development in the RAID, disk capacity is very expensive, is to be considered first, management simplicity and scalability of the importance of the fall in the second. Today, the management of hundreds of TB, or PB of data is a very commonplace thing, therefore, managing complex storage environments based on RAID technology is becoming difficult to accept. Now, the disk capacity is cheap, difficult to manage as a more important question, for RAID, we should change our understanding and practice. Long as they can significantly simplify storage management, in order to protect the data, we can expand more storage capacity.
RAID is quite complex
Why no RAID technology? It is too complex and require too much manual configuration, adjustment, analysis, and site management. It also sacrificing performance. If the reason was not sufficient, RAID reconstruction will always spend hours or even days. Since the emergence of self-RAID technology, RAID level RAID 0,1,3,5,10,30,50, and currently has JOBD etc., in addition to RAID 6,7,5 E, 5EE, DP, ADG, and many other proprietary standard RAID levels . Different RAID level, the combination of different hard drives, disk arrays to provide users with the performance and safety performance are also different. Range of levels of standards have been dazzling, management costs can be imagined.
What technology will replace the RAID technology? Who cares! In order to protect data from loss, storage systems should provide the availability and continuity of the normal working hours, the user should not be forced to care about RAID levels, or any other technology will replace it. In other words, users really need is to completely put into logical storage pools and virtual stripe of data storage systems. Then, when the number of drive failure, the original data should be able to back up the logical pool integrity preserved. All these operations should be transparent, and never need RAID reconstruction. When a new disk drive to the logic of the pool, the online and transparent process as the original data and backup data should be able to automatic load balancing to a new space. This is a simple and clear way. Perhaps this approach sounds a lot like RAID technology, but on the contrary, the current RAID is quite complex and confusing.
Goal is to reduce management stress
For all these reasons, from the consumer to high-end market, RAID must die. A "Fortune" 50 head of enterprise systems has said he needs is an enterprise-level performance, but managed like a consumer-level storage systems. If this is the user's goal, companies need to change the inherent understanding. Elimination of RAID technology is crazy to think of it, but if not, storage systems will never reach the necessary level of ease of use.
The rise in recent years a number of techniques to enable the industry to see some hope. Have businesses clustered storage modular architecture, each node including the intelligent control and the disk in two parts. When a user writes a file a certain cluster storage system, a node, this node will automatically split the file into several parts, reasonable storage to the system all the nodes. Clustered storage systems integrate all the devices to a virtual storage pool, the formation of a transparent global file system, not only improves the existing disk resource utilization, in turn relieves the pressure on storage management.
Beginning in 2007, solid-state hard disk access speed for its small size, easy to carry, and low energy consumption gradually been welcomed by many manufacturers and users, EMC has just announced their high-speed cache to DRAM as the center of the DMX Series storage system installed on flash-based solid state disk. Traditional disk and RAID technology dependent on it, are subject to a solid state hard drive challenges.
Some of the next generation of enterprise storage systems are simplified or removed RAID, this exciting, big companies should be the same the cards. The reason is simple: large companies have to promote market forces, to give way to promote RAID technology. High-availability storage systems no longer need RAID, the need for new technology to meet today's challenges.
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