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7.3FC-AL system errors
Information on the reporting of operational errors or faults across the interface is given in the Fibre Channel Interface Manual. The FCP Response returns information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.
Status returned by the drive to the initiator is described in the Fibre Channel Interface Manual. Status reporting plays a role in systems error management and its use in that respect is described in sections where the various commands are discussed.
7.4Background Media Scan
Background Media Scan (BGMS) is a
With BGMS, the host system can consume less power and system overhead by only checking BGMS status/ results rather than tying up the bus and consuming power in the process of
Since the background scan functions are only done during idle periods, BGMS causes a negligible impact to system performance. Background media scan will begin after 500ms of idle time. Other features that normally use idle time to function will function normally because BGMS functions for bursts of 800ms and then sus- pends activity to allow other background functions to operate. Additionally, BGMS operates in segments of 400 block reads, checking for host commands upon completion of each of the block segments.
The BGMS function will complete any
7.4.1Media Pre-Scan
Media
The drive will attempt to run BGMS on the entire pack of the drive. This will result in increasingly large portion so fthe drive having been accesed, provided there is adequate idle time to allow BGMS to run. During the Pre- Scan period, all Write commands that are in
Cheetah 10K.7 36GB FC Product Manual, Rev. A | 37 |