A B C D E F G H I J K L M N O P Q R S T U V W X Y Z << prev |  top | glossary index | bottom | next >> Definitions from Differential Backup to External RAID Controllers Differential backup A backup of all changes made after the last full backup. The advantage to this is the quicker recovery time, requiring only a full backup and the latest differential backup to restore the system. The disadvantage is that for each day elapsed since the last full backup, more data needs to be backed up. Disaster recovery Disaster recover is the process used to restore your backed up data in the event of a disaster. Disk A round plate on which data can be stored. Disks are divided into two categories magnetic (floppy disks, hard disk drives) and Optical (CD-ROM, DVDS). Disk Drives A machine that reads and writes data onto a disk. There are many different types of disk drives i.e. a hard disk drive which writes info to a hard drive or a Floppy drive which writes information to a floppy disk. Disk Duplexing This is a variation of disk mirroring in which each of the multiple storage disks has its own SCSI controller. This is the practice of duplicating data in separate volumes on two hard disks to make storage more fault-tolerant in case one drive goes down you can still access the other. Disk Striping The practise used to spread data over multiple hard disks. Disk striping can speed up data retrieval operations from disk storage. The user is normally allowed to set the data unit size of each strip. Disk-to-disk-to-tape This is an approach to computer storage backup and archiving in which data is initially copied to backup storage on a disk storage system and then periodically copied again to a tape storage system. Distributed Storage Distributed storage is set up so that each server has its own external storage subsystem. Drive image This is a form of backup which captures the entire contents of a drive including operating system, programs and user data to a single file. This file could be an incremental backup from a previous so only the changes would be taken. In turn the file could be sent online to a remote server, in case of fire / flood / etc. Dual Channel Embedded RAID A RAID controller is a dedicated piece of hardware which controls multiple physical hard drives in a PC / Server. It allows the data to be split and stored across these drives, dependent on setup, so that if one drive fails the data will still be available / online to users. A Dual channel RAID controller provides two points of connection so if one were to fail the other would take over. Encryption A method used to convert data (in the form of passwords, files or emails) into an illegible format if intercepted or accessed without the correct Encryption Key. The Key is a pass phrase set by the user encrypting the data before it is stored / sent online, with the encryption software performing complex mathematical operations on the data. External RAID Controllers Allow multiple devices / servers to access a form of Direct / Network attached storage, by keeping the RAID controller external from any one particular server. This means that if the server goes offline others will still be able to access the storage. << prev |  top | glossary index | bottom | next >> A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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