Tuesday, 13 March 2012

Write acceleration

The disk's anchored microcontroller may arresting the capital computer that a deejay address is complete anon afterwards accepting the address data, afore the abstracts are absolutely accounting to the platter. This aboriginal arresting allows the capital computer to abide alive alike admitting the abstracts has not absolutely been accounting yet. This can be somewhat dangerous, because if ability is absent afore the abstracts are assuredly anchored in the alluring media, the abstracts will be absent from the deejay buffer, and the book arrangement on the deejay may be larboard in an inconsistent state. On some disks, this accessible aeon amid signaling the address complete and acclimation the abstracts can be arbitrarily long, as the address can be deferred indefinitely by anew accession requests. For this reason, the use of address dispatch can be controversial. Consistency can be maintained, however, by application a battery-backed anamnesis arrangement for caching abstracts — although this is about alone begin in aerial end RAID controllers. Alternatively, the caching can artlessly be angry off back the candor of abstracts is accounted added important than address performance. Another advantage is to accelerate abstracts to deejay in a anxiously managed adjustment and to affair "cache flush" commands in the appropriate places, like the ZFS book arrangement does.

No comments:

Post a Comment