- Fibre Channel (FC)
- Serial-Attached SCSI (SAS)
- Internet SCSI (iSCSI)
Fibre Channel Disk Attachment
- Fibre Channel (FC) is a high-speed disk attachment technology primarily used for storage networking.
- It is designed to connect a large number of storage devices to a number of host servers across a Storage Area Network (SAN).
- Fibre Channel is a transport Protocol (FCP) which transfers SCSI commands and data over Fibre Channel networks.
- FC supports a much higher number of devices and much longer cable lengths than SCSI. It has become the preferred disk attachment technology in midrange and large scale data center solutions.
- Host servers contain one or more FC Host Bus Adapters (HBA).
What is HBA?
Serial Attched SCSI (SAS) disk attachment
- SAS is a computer bus used to move data to and from computer storage devices such as hard drives and tape drives.
- SAS depends on a point-to-point serial protocol that replaces the parallel SCSI bus technology, and uses the standard SCSI command set.
- Typical SAS throughput is 6 Gbps full duplex. SAS has the capability to reach 24 Gbps if the host can drive it at that speed. When the first 6 Gbps connection is full, the next 6 Gbps connection is used, and so on, up to four connections.
iSCSI disk attachment
- iSCSI stands for Internet Small Computer System Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities.
- By carrying SCSI commands over IP networks, iSCSI is used to facilitate data transfers over intranets and to manage storage over long distances.
- iSCSI can be used to transmit data over local area networks (LANs), wide area networks (WANs), or the Internet, and can enable location-independent data storage and retrieval.
- IP SANs are a cheaper alternative to FC SANs. However, the lower cost of iSCSI also implies lower performance and scalability
- A typical Ethernet network operates at 1 Gbps, whereas an FC SAN can run up to 8 Gbps. However you can improve the performance by using high bandwidth Ethernet Card. Migrating to 10 GbE can significantly increase the performance of an iSCSI infrastructure.
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