Disk Subsystem Unit - meaning and definition. What is Disk Subsystem Unit
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What (who) is Disk Subsystem Unit - definition

DISK STORAGE SYSTEM WHICH CONTAINS MULTIPLE DISK DRIVES
Storage array; Disk arrays; Disk array subsystem
  • HP EVA4400 storage array, consisting of 2U controller enclosure (top) and 4 2U disk shelves

Disk array         
A disk array is a disk storage system which contains multiple disk drives. It is differentiated from a disk enclosure, in that an array has cache memory and advanced functionality, like RAID, deduplication, encryption and virtualization.
disk drive         
  • A CD-ROM (optical) disc drive
  • Comparison of several forms of disk storage showing tracks (not-to-scale); green denotes start and red denotes end.<br /><nowiki>*</nowiki> Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.
  • Three floppy disk drives
STORAGE MECHANISMS THAT RECORD DATA ON THE SURFACE OF ROTATING DISKS
Disk drive; Computer disk; Disk Drive; Disc storage; Disc drive; Disk memory; Disc Drive; Disk (storage device); Rotating-disk memory; Data storage disk; Computer disc
<hardware, storage> (Or "hard disk drive", "hard drive", "floppy disk drive", "floppy drive") A peripheral device that reads and writes hard disks or floppy disks. The drive contains a motor to rotate the disk at a constant rate and one or more read/write heads which are positioned over the desired track by a servo mechanism. It also contains the electronics to amplify the signals from the heads to normal digital logic levels and vice versa. In order for a disk drive to start to read or write a given location a read/write head must be positioned radially over the right track and rotationally over the start of the right sector. Radial motion is known as "seeking" and it is this which causes most of the intermittent noise heard during disk activity. There is usually one head for each disk surface and all heads move together. The set of locations which are accessible with the heads in a given radial position are known as a "cylinder". The "seek time" is the time taken to seek to a different cylinder. The disk is constantly rotating (except for some floppy disk drives where the motor is switched off between accesses to reduce wear and power consumption) so positioning the heads over the right sector is simply a matter of waiting until it arrives under the head. With a single set of heads this "rotational latency" will be on average half a revolution but some big drives have multiple sets of heads spaced at equal angles around the disk. If seeking and rotation are independent, access time is seek time + rotational latency. When accessing multiple tracks sequentially, data is sometimes arranged so that by the time the seek from one track to the next has finished, the disk has rotated just enough to begin accessing the next track. See also sector interleave. The disks may be removable disks; floppy disks always are, removable hard disks were common on mainframes and minicomputers but less so on microcomputers until the mid 1990s(?) with products like the Zip Drive. A CD-ROM drive is not usually referred to as a disk drive. Two common interfaces for disk drives (and other devices) are SCSI and IDE. ST-506 used to be common in microcomputers (in the 1980s?). (1997-04-15)
disk drive         
  • A CD-ROM (optical) disc drive
  • Comparison of several forms of disk storage showing tracks (not-to-scale); green denotes start and red denotes end.<br /><nowiki>*</nowiki> Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.
  • Three floppy disk drives
STORAGE MECHANISMS THAT RECORD DATA ON THE SURFACE OF ROTATING DISKS
Disk drive; Computer disk; Disk Drive; Disc storage; Disc drive; Disk memory; Disc Drive; Disk (storage device); Rotating-disk memory; Data storage disk; Computer disc
¦ noun a device which allows a computer to read from and write on to computer disks.

Wikipedia

Disk array

A disk array is a disk storage system which contains multiple disk drives. It is differentiated from a disk enclosure, in that an array has cache memory and advanced functionality, like RAID, deduplication, encryption and virtualization.

Components of a disk array include:

  • Disk array controllers
  • Cache in form of both volatile random-access memory and non-volatile flash memory.
  • Disk enclosures for both magnetic rotational hard disk drives and electronic solid-state drives.
  • Power supplies

Typically a disk array provides increased availability, resiliency, and maintainability by using additional redundant components (controllers, power supplies, fans, etc.), often up to the point where all single points of failure (SPOFs) are eliminated from the design. Additionally, disk array components are often hot-swappable.

Traditionally disk arrays were divided into categories:

  • Network attached storage (NAS) arrays
  • Storage area network (SAN) arrays:
    • Modular SAN arrays
    • Monolithic SAN arrays
    • Utility Storage Arrays
  • Storage virtualization

Primary vendors of storage systems include Coraid, Inc., DataDirect Networks, Dell EMC, Fujitsu, Hewlett Packard Enterprise, Hitachi Data Systems, Huawei, IBM, Infortrend, NetApp, Oracle Corporation, Panasas, Pure Storage and other companies that often act as OEM for the above vendors and do not themselves market the storage components they manufacture.