Problhmata diskou - status errors

[Dimitrios P. Bouras]

Sotiris Tsimbonis wrote:
> 
> Exei dei kaneis paromoia mynhmasa sto syslog `h 3erei pou mporei na
> ofeilontai? To mhxanima exei panw enan IDE disko Quantum 800MB primary kai
> ena ATAPI cd-rom stan slave..
>
> Mar 18 04:54:44 elena kernel: hda: status error: status=0x80 { Busy }
> Mar 18 04:54:44 elena kernel: hda: disabled DMA
                             (a)^^^^^^^^^^^^^^^^^
> Mar 18 04:55:00 elena kernel: ide0: reset: master: passed; slave: failed
                             (b)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Swthrh,

Exw *poly* (ma *para poly*) kakh entypwsh apo tous diskous ths
Quantum, par'oti "pernoun" gia tous pio "sfairatous" ths agoras.
Prosfata, ebala dyo Quantum Fireball (master kai slave) sto
ide1 channel, kai *den* ennousan na doulepsoun swsta (random
data corruption otan antegrafes megala arxeia h kanontas poly
megala tar files, kai alla tetoia anatrixiastika...). Peritto na
pw oti ekana oti dokimes mporei na fantastei kaneis, peirazontas
parametrous me to hdparm. Tous antikatesthsa me dyo Western
Digital idias xwrhtikothtas kai ta problhmata e3afanisthkan. H
taxythta twn diskwn ths WD einai kata 20% mikroterh sta tests tou
hdparm (~8MB/s anti ~10MB/s) alla *douleuoun*. Se kat'idian "off
the record" suzhthseis me texnikous tou service department poly
gnwsths etairias mou anafer0hke oti "mas exei tyxei se partida
Quantum na psaxnoume disko pou na douleuei swsta" (!!!). Den 3erw
ean o diskos sou exei paromoia problhmata, alla ean exeis to
deutero IDE kanali (ide1) eleu0ero, synedese ekei to CD-Rom
(single h master), kai oxi san slave ston Quantum.

Gia tis shmeiwseis mou sta mhnymata tou syslog sou:

(a) o IDE driver tou kernel lei oti kanei disable to DMA. Exeis
    kanei enable to DMA gia to /dev/hda mesw tou hdparm? Ean nai,
    yparxoun periptwseis opou den ginetai na kaneis enable/disable
    to DMA *3exwrista* gia to ka0e IDE device. Ean ontws isxyei
    se authn thn peritpwsh, pi0anotata to CD-Rom sou den
    yposthrizei DMA (den gnwrizw kan ean yparxoun CD-Roms pou to
    yposthrizoun). Ean 0es DMA sto /dev/hda gia ton disko, synistw
    (kai pali) na baleis to CD-Rom sto /dev/hdb.

(b) Edw aplws fainetai oti o controller tou CD-Rom "ta epai3e" kai
    oute me to "reset" pou tou esteile o driver den ta katafere.

Kati paromoio me auto pou sou exei prokypsei mou eixe tyxei kai
emena me ena palaio drive syndedemeno sto idio IDE kanali me ena
pio sygxrono. To sygxrono yposthrize DMA enw to palaio oxi. Kata
la0os, kapoia stigmh, paizontas me to hdparm ekana enable to DMA
kai sto palaio. Bghkan kapoia mhnymata paromoia me auta pou
esteiles sth lista, kai ligo meta o driver ekane disable to DMA.
Sth dikh mou periptwsh omws, htan dynaton na ginei enabled to DMA
gia to ena drive kai disabled gia to allo, sto idio kanali. Gia
ton syndyasmo tou Quantum sou me to CD-Rom auto mporei na mhn
einai dynaton na ginei. H lysh einai na paei to CD-Rom se allo
kanali (ide1). Opws kai na exei, CD-Roms san slave sto idio kanali
me grhgorous diskous einai genika asxhmh idea, kai sth pleiopshfia
twn periptwsewn epibradynei thn taxythta metagwghs dedomenwn
(transfer rate).

 Elpizw ta parapanw na se boh0hsoun na lyseis to problhma,
 me xairetismous,

 Dhmhtrhs
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