RAID sync

[Apollon Koutlidis]

V13 wrote:
> Ayto poy epathes einai apolyta fysiologiko ean to motherboard soy ekopse to 
> reyma se kapoio apo toys diskoys eno eixe dedomena sth write cache. Dedomenoy 
> toy oti to resync exei synexomenio I/O, einai sigoyro oti ypirxan dedomena 
> sth write cache toy diskoy poy itan out-of-sync. Episis einai poly pithano na 
> min prolaban na graftoyn oi plirofories ths teleytaias stigmis sto superblock 
> ton ypoloipon diskon.
>
> Efoson aneferes oti o enas diskos itan USB einai poly pithano kai to na egine 
> disable to USB port kai na kopike to reyma prin prolabei o diskos na grapsei 
> oti ithele.
>   
Den eixa data corruption sta dedomena tou RAID - th deuterh fora 
toulaxiston. To problhma htan sta metadata tou array sumfwna me ta opoia 
to array twn 3 diskwn apoteloutan apo 4 diskous apo tous opoious oi 2 
htan mh-dia8esimoi kai to array twn 4 diskwn apo 5 apo tous opoious pali 
oi 2 htan mh-dia8esimoi. Ekana re-assemble to array me ton pragmatiko 
ari8mo diskwn kai enan missing kai ... afou ekane re-sync, tou perase 
(auta ap' oso mporw na 8umh8w, profanws). Kapoia stigmh elpizw na brw 
xrono (kai dia8esh) gia na peiramatistw peraiterw.

A.