Fiber Optic Wiki

Serial attached SCSI: comparison with parallel SCSI

July 29, 2011

The SAS bus operates point-to-point while the SCSI bus is multidrop. Each SAS device is connected by a dedicated link to the initiator, unless an expander is used. If one initiator is connected to one target, there is no opportunity for contention; with parallel SCSI, even this situation could cause contention.

Host Bus Adapter

July 28, 2011

An iSCSI host bus adapter (more commonly, HBA) implements a hardware initiator.

Hardware initiator

July 28, 2011

A hardware initiator uses dedicated hardware, typically in combination with software (firmware) running on that hardware, to implement iSCSI.

Software initiator

July 28, 2011

A software initiator uses code to implement iSCSI.

Network booting

July 28, 2011

For general data storage on an already-booted computer, any type of generic network interface may be used to access iSCSI devices. However, a generic consumer-grade network interface is not able to boot a diskless computer from a remote iSCSI data source. Instead it is commonplace for a server to load its initial operating system from a TFTP server or local boot device, and then use iSCSI for data storage once booting from the local device has finished.

Storage consolidation and Disaster recovery

July 28, 2011

Organizations move disparate storage resources from servers around their network to central locations, often in data centers; this allows for more efficiency in the allocation of storage. In a SAN environment, a server can be allocated a new disk volume without any change to hardware or cabling.

|< < .... 137 138 139 140 141 142 143 144 145 146 147 .... > >|

Showing 847 to 852 of 1106 (185 Pages)