Introduction to the Storage
The term Storage occupies the major role in the world full of technology , we are using Devices like computer’s , laptop’s , mobile phone’s in all these things the major specification are based on the storage of device, cause every thing we use or want to see will store in the system storage of device.
There are two different type of storage devices which are in the form of Internal & External devices. Internal storage (Hard drives) are devices which comes builtin with system & External storage (Pen drives , CD/DVD drives) are temporary storage which are used in transferring data.
Classification of Storage
- Direct Attached Storage (DAS)
- Network Attached Storage (NAS)
- Storage Area Network (SAN)
Direct Attached Storage
The Direct Attached Storage (DAS) are kind of internal storage device which are connected with the help of point to point connectivity and for storing data in the DAS we don’t require any network connection , Host must be directly connected through the device for connecting the device via system we need protocols like ATA, SATA, SCSI, SAS and fiber optic channel.
Examples of DAS – Hard Drives, Solid State Drives, Optical Disk Drives.
Network Attached Storage
The Network Attached Storage (NAS) are storage which uses network connection for storage, The storage are accessed through IP to IP connection , the storage can be shared between storage then user can access the storage and supports the file like NFS, SMB or CIFS. Many smart homes rely on NAS to provide central storage for smart TV’s.
Types of NAS
- Integrated NAS
- Gateway NAS
Storage Area Network
The Storage Area Network (SAN) provides highest speed and it is most reliable network used between the server & storage for data transfer. They can use fibre channel & fibre channel over storage.
The storage devices are also classified on speed of disk and they have different mode of Transmission and this can be classified as Parallel & Serial.
Comparison of Disk based on Transmission mode
IDE (Integrated Drive Electronic)
ATA (Advanced Technology Attachment)
SCSI (Small Computer System Interface)
SATA (Serial Advanced Technology Attachment)
FC ( Fibre Channel)
SAS (Serial Attached SCSI)
SSD (Solid State Drive)
FATA (Fibre Attached Technology Adapted)
NL SAS (Near Line SAS)
EFD (Enterprise Flash Drive)
Enterprise Flash Drive
Enterprise Flash Drive is the fastest drive in the field of storage device. It introduces a new performance level of storage to enterprise and commercial storage users. Flash drives uses solid state memory as the media for data storage in place of rotating hard disks drives (HDD).
Comparison of Disk based on Speed
|SCSI (Small Computer System Interface)||5400rpm|
|SATA (Serial Advanced Technology Attachment)||7200rpm||150-300 I/O|
|FC (Fibre Channel)||15000rpm||180 I/O|
|SAS (Serial Attached SCSI)||15000rpm||300 – 500 I/O|
|SSD (Solid State Drive)||1000 – 10000 I/O|
|EFD (Enterprise Flash Drive)||100000000 I/O|