Chapter 5

CLOUD STORAGE

A cloud storage is a model in which data is transmitted and stored on remote storage systems, where it is maintained, managed, backed up and made available to users over a network. Users usually pay for their cloud data storage on a per-consumption, monthly rate. Cloud storage providers have added operating expenses that can make the technology considerably more expensive to use. The security of cloud storage services continues to be a concern among users. A cloud storage is a prototype wherein information is sent and put away on far off capacity frameworks, where it is kept up, oversaw, supported up and made accessible to clients over an organization. Cloud storage suppliers have added working costs that can make the innovation impressively more costly to utilize

Types of Cloud Storage:

There are three main cloud-based storage access models, they are as follows:

Public cloud storage:                                                                                                                                                     

Public cloud storage administrations give that is generally appropriate for unstructured information on a membership premise. Information is put away in the specialist co-op’s server farms with the capacity information spread over different districts or landmasses.

Private Cloud Storage:                                                                                                                             

Private cloud storage is a sort of capacity component that stores an association’s information. Private distributed storage is like public distributed storage, in that it gives the ease of use, versatility and adaptability of the capacity design

Hybrid Cloud Storage:                                                                                                                     

Hybrid distributed storage is a way to deal with overseeing distributed storage that utilizes both neighborhood and off-sit assets. The crossover distributed storage framework is frequently used to enhance inner information storing with public distributed storage.

Advantages of Cloud Storage:

  1. Low cost
  2. Accessible
  3. backup: .
  4. Syncing and Updating:
  5. More Safe

Disadvantages of Cloud Storage:

  1. Internet connection:
  2. Costs:
  3. Hard drives:
  4. Support:
  5. Privacy:

STORAGE

STORAGE HARD DISKS

A hard disk drive is a non-volatile pc storing device holding magnetic disks or plates rotating at its high speeds

CHARACTERISTICS OF A HARD DISK

  • Hard disk delivers big storing volume.
  • The volume of individual pc hard disk is from 160GB to 2TB and extra.
  •  Quicker than floppy disks.
  •  Main media designed for storing data and programs.

RAID

RAID abbreviation of redundant array of inexpensive disks or redundant array of independent drives. This is expertise that is utilize to rise act or consistency of data storing. A RAID system contains of 2 or further drives working in corresponding. RAID is usually utilized on servers. Drobo is a illustration of a device by means of RAID technology. Here are diverse RAID stages, individually enhanced for a specific situation. It clarifies why corporations occasionally come up

The stages are:

RAID 0 – Stripping

In RAID 0 ,Data are divided into chunks which get written across entire the drives in the collection by using numerous disks on the similar period, provide superior I/O performance.

RAID Level 1 – Mirroring

Data are kept double by marks them to equally the data drive and a mirror drive.

RAID level 5

this is the furthermost safe RAID stage. It needs at minimum three drives but may work via up to 16. Data chunks are spread over the drives.

RAID Level 6- Stripping with double parity

RAID 6 is similar with RAID 5, but then the parity data are write on 2 drives. It means it needs minimally 4 drives and may survive 2 drives dying concurrently.

RAID Level 10 – Combining RAID 1 and 0

This is may happen likely to syndicate the pros and cons of RAID 1 and RAID 0 in solo system. It’s a mixture of RAID arrangement. This is delivers safety by emulating whole information at subordinate drives.

What about RAID Level 2, 3, 4, and 7?

2,3,4,and 7 stages do exist .whoever  are not that common.

NAS

NAS abbreviation of  Network-attached storage is a file storing which allows numerous users and diverse customer devices to recover data from central disk volume. 

Benefits/Advantages of NAS

  • improve adequate storing space in a pc.
  • data is accessible from single central site.
  • It also delivers the ability of automatic data backup.
  • Data is safe.

Disadvantages

  • The core difficulty of NAS device is that it typically has Linux operating system and file systems that become it problematic to recover data in case of failure from alternative OS.
  • Require core knowledge
  • Additional drawback of NAS storing solution is it is onsite data backup/additional copy of data .

EXTERNAL & REMOVEABLE HARD DISKS

It is a device which is connect with your appliance to provide nearly instant storing space. External devices are moveable storing devices usually utilized to stock data like as pictures, videos, and important documents. removable /Detachable hard drive is a kind of disk-drive scheme in which hard disks are surrounded in plastic or metal containers. Due to this you can move this devices.

Advantages

  1. Storage capacity
  2. Backup Drive:
    1. Improved Performance:
    2. Portability:
  3. Longer life:

Disadvantages

  1. Slow Speed.
  2. Break easily.
  3. Overheating issue

MINIATURE OF HARD DISKS

This is smaller then hard disk. Both outer and interior hard disk are accessible in small sizes. The gadget, for example, versatile media player, computerized cameras and advanced cells generally have inward smaller than expected hard plates. These disk/plates give more stockpiling limit at that point streak memory. The outer hard circles that contain small scale hard plates that are likewise called pocket hard drive. The capacity limit of little hard plates is from 1 GB to 320 GB.

HARD DISK CONTROLLERS

A disk controller consists of a chip and electronic circuits. It controls transfer of data, instructions and information between disk and system bus as other components of computer. A disk controller for a hard disk is called hard disk controller. It can be a part of hard disks or motherboard. It may also be separate adapter card in the system unit. A disk regulator comprises of a chip and electronic circuits. It controls move of information, guidelines and data among plate and framework transport as different parts of PC. A disk/plate regulator for a hard circle is called hard disk controller. It may very well may be a piece of hard disk or motherboard of pc.

MAINTAINING DATA STORED ON A HARD DISK

When your computer stores data on its hard drive, it doesn’t just throw magnetized nails into a box, all jumbled up together. The data is maintained in a very orderly pattern on each platter. Bits of data are arranged in concentric, circular paths called tracks. Each track is broken up into smaller areas called sectors. By following these tips we can maintain our data stored on a hard disk:

  1. Keep dust out. Residue is awful for hardware.
  2. Eject appropriately
  3. Keep them cool
  4. Don’t pointlessly turn off your outside hard drive.