Peri HDA , HDA1 .......

[Liakakis Kostas]

On Mon, 3 Mar 1997, Christofer Karatzinis wrote:

> PS: synexizw na 0elw kapoion pou katexei to 0ema (px kanan pou spoudazei
> arxitektoniki ypologistwn klp) na mas kanei mia grigori analysi tou 0ema-
> tos na kseroume kai emeis ti paizei (px simera ema0a kati peri DMA channel
> etc).

Toso to EIDE kai fysika perissotero to SCSI ypostirizoun tautoxronh
apostolh requests pros diaforous diskous. Arxizontas apo to EIDE, gia na
symbei auto xreiazomaste devices kai sta dyo kanalia. Arketoi controllers
ypostirizoun sosta thn tautoxronh apostolh entolon stous diskous. Alloi,
opos o CMD640B exoun bugs kai auto einai apenergopoihmeno (... ide1
enabled, seriallised with ide0...). Apo kei kai pera, opoios diskos
teleiosei protos, apanta, pairnei nea entolh, klp...

Oi entoles aforoun kinhsh kefalon, sector read/write, querry/set disk
parameters, den-3ero-go-ti-allo.

Sto SCSI ka0e diskos exei kati san buffer gia eiserxomenes entoles, tag
queues legontai, opote mporeis na tou steileis seira apo entoles na tis
ektelesei. Syn to oti to overhead gia to SCSI einai poly mikrotero apo
auto gia to IDE.

Epishs, einai profanes, oti akomh kai sto idio IDE kanali, enas primary
kai enas slave mporei na einai kalyteroi apo ena disko monaxo, mias kai
apofeugeis na kinhseis tis kefales se allh 0esh. Px, mporeis na exeis to
swap sto slave disko kai to root fs ston master. an h taxythta to diskon
einai sygkrishmh, eisai se kalyterh 0esh apo oti me ena disko.

Auta ta poly oliga. Alloste ego einai enas Fysikos :-)

- -K.
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