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Data storage
Data is the most important part of the (many companies call data center room) in the entire computer system, data is the lifeblood of most companies, is very precious. Data storage development has been a long time, with cloud computing is no special relationship.
What is stored
Vernacular medium in which information is recorded, the next figure is our common storage medium. Home computers now commonly used general mechanical hard disk storage.
What is storage virtualization
Storage virtualization is a logical layer was added on the storage device, access to the storage resources by logical layer
For administrators, you can easily adjust the storage resources, improve storage utilization
The end user, the centralized storage devices may provide better performance and ease of use
Storage virtualization principles
Raw Device + Logical Volume
- + Nude equipment is the most direct way of logical storage control, directly over into a common block storage layer 1 G block units, these units through the management, maintenance operation to achieve the volume;
- IO path simple, *** read and write performance, but does not support advanced services;
Storage device virtualization
- Storage device virtualization through storage devices is the ability to achieve the maintenance operation volume, and storage devices can also provide some advanced storage services such as thin provisioning, snapshots and linked clones
- The advantage of this technology: nothing to do with the host, do not take up host resources, rich data management capabilities.
- The disadvantage of this technology: generally only achieve virtualization of the equipment within the disk. Data management functions among different vendors can not interoperate. Multiple sets of storage devices need to configure multiple sets of data management software, high cost.
+ File system storage virtualization
Host storage virtualization + file system means that the host file system management virtual machine disk files, and provide many advanced services through the virtualization layer, which is currently the industry to adopt more virtual way.
- It supports heterogeneous servers and heterogeneous storage
- Advanced feature-rich, it does not rely on hardware
- Advanced feature-rich, it does not rely on hardware
- IO path is longer, the performance lossy
Compare
Each virtual platform storage virtualization solutions
VMware
Various programs are supported, free to choose
