Re: Velikost alokacniho bloku, subalokace

From: Petr Matousek <matousek@CHV.PVT.CZ>
Subject: Re: Velikost alokacniho bloku, subalokace
Date: Mon, 26 Feb 1996 14:40:55 +-100
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Od:     Petr Vodicka[SMTP:UG%POK0.VSZBR.CZ@earn.cvut.cz]
Odesl=E1no:     26. =FAnora 1996 14:58
Komu:   Multiple recipients of list CSINFO-L
P=F8edm=ECt:    Velikost alokacniho bloku, subalokace
 
Vazeni,
 Prosim Vas, nevi nekdo, jak se resi nasledujici problem:
 
 Operacni systemy pouzivaji ruzne souborove systemy. Nejrozsirenejsim
 se zda byt FAT/VFAT systemu MSDOS/Windows.
 Data se prideluji po kvantech - alokacnich blocich. Pokud si vytvorim
 soubor, ktery ma velikost 1 byte, na disku mi zabere CELY alokacni =
blok.
 Takze zbytek prostoru je ztracen. Tak to funguje v DOSu. Pokud mam
 velky disk (> 1GB), ktery ma alokacni blok trebas 8 kB, ztracim na =
disku
 s velkym poctem mensich souboru pomerne hodne mista.
 Novell 4.XX nam umoznuje tzv. subalokaci, tzn. ze soubor se nemusi =
ukladat
 na hranici noveho alokacniho bloku, ale umi si vlezt i do posledniho -
 ne zcela zaplneneho - alokacniho bloku jineho souboru.
 
 Otazky:
 
 1. Mam moznost v DOSu/Winodows si zvolit velikost alokacniho bloku
    (myslim pres nejakou utilitku, nebot vlastni DOS to neumi - pokud =
vim).
    Stacker a podobne real-timove pakovace neberu - zbytecne problemove.
 
Nemate sanci - velikost clusteru se urcuje automaticky tak, aby byly co=20
nejkratsi za podminky, ze jich bude maximalne 65535. Velikost clusteru=20
ale musi byt v rade 2 na entou KB.
 
 2. Jelikoz velikost alokacniho bloku zalezi patrne na velikosti =
logickeho
    disku (alespon v DOSu) je mou jedinou moznosti jak setrit misto - a
    snizit tak ztraty - rozsekat velky disk na nekolik malych?
    (Samozrejme - nejlepsi by bylo vsechny male soubory zabalit do =
jednoho
    velkeho, ale to neni to prave orechove)
 
To je jediny postup, ktery vam nezpomali praci. Ovsem zase budete na =
stiru
s vyuzitim disku z duvodu vice logickych svazku. Ja pouzivam logicke =
disky
do 512 KB. Tam jsou ztraty mista jeste prijatelne.
 
    Opakuji, ze Doublespace ci Stacker me moc nepresvedcily (neb chci
    pouzivat NT s moznosti dual bootu na DOS a stackrovany disk bych z =
NT
    asi videl, ale to je tak vsechno)...
 
Castecne reseni je pouzivat k odkladani mene casto pouzivanych dat =
archivy (ZIP).
S pomoci vhodneho spravce souboru (napr. Windows Commander) s nimi =
muzete=20
pracovat jakz takz pohodlne pod Windows 3.1x, 95 i NT.
 
Zdravi
                        Petr Matousek
 
 
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