D-Channel ISDN
ISDN control messages used in transmission channel.
Daemon UNIX
UNIX systems to handle a particular service program, usually in the background (BACKGROUND) implementation, such as regular backups (BACKUP) program or Web server (WEB SERVER). Similar programs have different names in different systems, such as DOS, there referred to as the Permanent Mission of the program (TSR), in the MICROSOFT WINDOWS NT, this is called service (SERVICE).
DAFS file system stored directly
DAFS (Direct Access File System)
DAFS is a network storage in the new technology. It as a file system agreement to combine the advantages of SAN and NAS technology, data transmission even in a large number of excessive load, effectively reduce the calculation of the pressure storage servers to improve storage system performance.
DAFS The basic principle is to read and write files by shortening the time of the server data path, reducing and re-allocation of CPU's computing tasks. It provides memory to memory direct transmission channel, so that data blocks do not need to copy the work through the application server and file server CPU, but in the two physical devices pre-mapped buffer in direct transmission.
In other words, the file can be directly transferred by the application server memory to a storage server memory, without having to fill a variety of systems and network receiver buffer. In this way, the file I / O operation has accelerated, while the storage network traffic actually declined. Also, because the operating system for file operations involved less processing power savings were released.
Daisy Chain Hardware
So that all connected devices one after another hardware device connection method to the computers do not have to set up a connection for each device. For example, SCSI is a part of DAISY CHAIN connections. |
