HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 446
Fibre Channel Arbitrated Loop FC-AL, Fibre Channel Protocol for SCSI FCP, flushing cache
View all HP Surestore Disk Array FC60 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 446 highlights
25 MB/s (quarter speed), or 12.5 MB/s (eighth speed) over distances of up to 100 m over copper media, or up to 10 km over optical links. The disk array operates at full speed. Fibre Channel Arbitrated Loop (FC-AL) One of three existing Fibre Channel topologies in which two to 126 ports are interconnected serially in a single loop circuit. Access to the FC-AL is controlled by an arbitration scheme. The FC-AL topology supports all classes of service and guarantees in-order delivery of Fibre Channel frames when the originator and responder are on the same FC-AL. The disk array's default topology is arbitrated loop. Fibre Channel Arbitrated Loop Hub A full-duplex, 1.063 Gb/s intelligent hub used in an FC-AL topology to increase the loop's reliability, the number of loop connections, and the distances between the host system(s) and disk array(s). A maximum of ten devices can be connected to each FC-AL hub. Fibre Channel Protocol for SCSI (FCP) FCP defines a high-level Fibre Channel mapping layer (FC-4) using lower-level Fibre Channel (FC-PH) services to transmit SCSI command, data, and status information between a SCSI initiator and a SCSI target across the Fibre Channel link using Fibre Channel frame and sequence formats. flushing cache The process of writing the contents of write cache memory to a disk. Flushing occurs at regular intervals during normal operation, and when power to the disk array is interrupted. foreign controller Any controller other than the last one to complete the Start-Of-Day process in a given slot. At the completion of the SOD process, the identification of the controller is stored. If a different controller is installed in the slot, it is considered foreign. See resident controller. 446