Peri HDA , HDA1 .......

Mon Mar 3 11:23:45 EET 1997

>  Den se katalabainw... To Unix den xeirizetai tis syskeves tou etsi. Oute
>kan moiazei o tropos xeirismou.
==========================================

?????????????????

==========================================
> Den ginetai pouthena kapoio "expansion" apo
>/tmp/to_arxeio se /dev/hda1/tmp/to_arxeio. Oxi opws to les, toulaxiston.
==========================================
Apla.
Milaw gia th logikh ths upo8eshs enw esu milas
 gia thn ulopoihsh ths.

=============================================
>
>  Ontws briskoume prwta to apolyto onoma tou arxeio. Ontws koitame sto mtab
>(sth mnhmh fysika, oxi sto disko) gia na broume se poia syskevh einai to
>arxeio. Meta omws pername mesa apo to VFS kai zhtame access sto arxeio. Apo
>kei kai pera den mas noiazei ti ginetai, alla to VFS milaei sto E2FS h
===========================================

To basiko mou meiwnekthma einai oti me noiazei panta to ti ginetai.

============================================
>opoiodhpote allo FS xrhsimopoioume kai h prosbash einai apeftheias sto
>disko, oxi se kapoio allo directory structure...
>
>  Ektos ki an prospatheis na peis kati allo, opote dhlwnw thn agnoia mou kai
>zhtaw perissoteres plhrofories. :-)

=======================================================

Apla 3anadiabase to keimeno mou.
An h8ela na analusw thn ulopoihsh autwn pou perigrafw tote anagkasthka
8a eftana sta VFS kai E2FS k.l.p.

=======================================================
>
>
>> 1.)To hda1 exei plhrofories gia ta xarakthristika ths partision kai epomenws
>> einai ane3arthth ths fusikhs sukeuhs.
>> Etsi otan alla3a to sda se hda den htan anagkh na alla3w kai to
>> hda1 afou auto periexei swstes plhrofories ( epeidh to xameno
>> to programma egkatastashs katalabe ton scsi disko san IDE
>> kai "egraye"  tis plhrofories gia thn partition sto /dev/hda1)
>
>  Synexizw na mhn katalabainw. Ksereis panw katw ti einai ta device
>major/minor numbers? An ta arxeia /dev/soupitsa kai /dev/keftedaki exoun ta
>idia major/minors, tote einai AKRIBWS to idio device. Dokimase to. man
>mknod.
===================================================

Epanalambanw diabase 3ana to keimeno mou.
Gia ta major/minor "do3a tw 8ew"  kati katafernw.

Oso gia ta man h biblio8hkh mou dia8etei ta texnika egxeiridia twn
IBM, ATT , SCO , COHERENT, LINUX,

(Epi th eukairia proteinw to biblio pou sunodeuei to COHERENT se
opoion 8elei na katanohsei thn "pisw pleura twn keimenwn".)

===================================================
>
>  TO /dev/hda1 DEN exei plhrofories gia ta xarakthristika tou partition,
>ektos ki an eixes kanena periergo atyxhma me to fdisk(1). To partition table
>einai sto prwto POSIX block (IDE sector, 512 bytes) tou /dev/hd?. An
>allakses to sda se hda, ti major/minor exoun ta sda*, hda* devices? Mporeis
>na kaneis ena ls -la? Ap'oti kserw, ena mv(1) den allazei to device, mono to
>onoma tou.
>
====================================================
brw-rw----   2 root     disk       8,   0 Apr 29  1995 hda
brw-rw----   2 root     disk       3,   0 Apr 27  1995 hda.old

8a se parakalousa na mas e3hghseis ti einai to /dev/hda1 kai poia h sxesh
tou me to disko mou.
Bebaia den 8elw analush kai orologia deka aples koubentes .
Eimai bebaiws oti 8a anakaluyeis pws leme ta idia pragmata

====================================================
>
>> 2) Katalabainoume giati einai pio grhgorh h egrafh se mounted
>> file sustem apo oti se kanoniko directory ( ena bhma ligotero)
>> p.x. /proc  /swap e.t.c
>
>  Pws mporeis na grapseis se "kanoniko directory" an den einai mounted? To
>swap space den einai directory, einai partition h file. Mhpws prospatheis na
>sygkrineis thn apeftheias prosbash sto disko kai thn prosbash sto disko mesw
>enos FS? An nai, ontws h prwth methodos einai pio grhgorh. Alla sth defterh
>periptwsh YPARXEI FS (to procfs), kai den yparxei diskos (ta periexomena tou
>/proc ta ftiaxnei o kernel, den einai grammena kapou sto disko sou).
>
=====================================================

3anadiabase to keimeno mou.
Epi th eukairia giati einai kalhtera to /proc  na einai mounted fs kai oxi apla
ena directory (pera apo 8emata asfaleias)?

====================================================

>
>> 3) Katalabainoume giati ena susthma me duo diskous twn
>> 500Mb enai pio grhgoro apo ena susthma me enan disko tou 1Gb
>
>  Afto symbainei epeidh dyo diskoi twn 500Mb mporoun na diabasoun taftoxrona
>1024 bytes th fora anti gia 512 bytes th fora... Alla synexizw na mhn
>katalabainw... Argh.
>
===============================================

Epeidh bare8hka na sou tonizw na 3anadiabaseis to keimeno mou,
Duo diskoi ison duo suskeues ison yeudo-tautoxronh trofodothsh ison
tautoxronh epejergasia apo tous embeded conttrolers kai tis
embeded cache

===============================================

>
>> Se duo diskous mporei na exoume tautoxronh diekpairewsh afou
>> ta aithmata apeu8unontai  se duo diaforetikes suskeues
>> An malista einai kai SCSI tote h taxuthta diaforopoieitai dramatika
>>
>
>> [ Istoriko :
>> Megalh egkatastash.
>> Unix - 486 sta 25 - 8 Mb Ram - 1Gb se 2 Diskous - 32 Users
>> To susthma einai sxedon nekro otan oi xrhstes douleuoun.
>> Anagkazomaste na baloume disko kai anti gia enan topo8etw
>> 3 diskous twn 500 Mb kai spaw se autous tis efarmoges.
>> To susthma ginetai 3afnika upoferto.
>> *Eutuxws autes tis meres alla3an Server*
>> ]
>
>  Afto einai aplo. Exete eksairetika disk intensive efarmoges kai ligh mnhmh
>(8 MB gia 32 xrhstes einai mallon ligo atyxes). Yphrxe para poly disk
>access, alla oi diskoi htan sto idio IDE bus, swsta? An baleis tous diskous
>se diaforetika IDE buses, mporoun na doulevoun taftoxrona (alliws mono enas
>mporei na xrhsimopoiei to bus ana pasa stigmh). Afto gia IDE, fysika. To
>SCSI symperiferetai pio grhgora, alla kai afto exei problhmata ths idias
>fyshs.
>
==============================================

1.) Leme ta idia pragmata me diaforetikes le3eis.
2.) Me IDE den exw polla pare-dwse. Douleuw sta8era kai monima
se SCSI apo ton kairo pou bghkan oi prwtes SCSI suskeues.

- -O
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