1. Directly Attached Storage (DAS) :
The storage device which is permanently attached to a desktop computer. DAS is for a single user (Hard drive attached to a computer). It is well suited for a small-to-medium sized business where sufficient amounts of storage can be configured at a low startup cost. The DAS enclosure will be a separate adjacent cabinet that contains additional disk drives.
Component of Directly Attached Storage (DAS) –
1. Storage devices 2. Cables 3. Disk Array 4. Protocol 5. Storage protocols: ATA, SCSI, SAS, SASA, FC
2. Storage Area Network (SAN) :
SAN acts on block level over network. Storage which can be accessed using ISCSI or FC. Suitable for business-critical applications and where high performance is required. The main benefit to a SAN-based storage solution is ability to share storage arrays to multiple servers. This allows you to configure storage capacity as needed, usually by a dedicated SAN administrator. Higher levels of performance throughput are typical in a SAN environment, and data is highly available through redundant disk controllers and drives.
Components of Storage Area Network (SAN) –
1. Node ports 2. Cables 3. Interconnect device such as: Hubs, switches, directors 4. Storage arrays 5. SAN management Software
Difference Between DAS and SAN :
|1.||DAS stands for Direct Access Storage.||SAN stands for Storage Area Network.|
|2.||For backups and recovery, Sectors are used.||For backups and recovery, Block by block copying technique is used.|
|3.||It is easy to install.||It is difficult to install.|
|4.||It is not complex.||It is complex.|
|5.||It is less expensive||It is more expensive.|
|6.||For data transmission, IDE/SCSI is used.||For data transmission, Fiber Channel, IP is used.|
|7.||Its capacity in bytes is 10^9.||Its capacity in bytes is greater than 10^12.|
|8.||It does not allow to share files at different operating system.||It allows to share files at different operating system.|
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