"Pourquoi ? T'as des sources ? Je ne vois pas de différence théorique entre les deux ..."
Oui, j'ai des sources, dans /usr/src/linux//Documentation/md.txt
Degraded = il manque un disque
Dirty = arrêt brutal
Le cas classique c'est la coupure de courant avec la défaillance d'un disque (l'un entrainant l'autre).
"If a raid5 or raid6 array is both dirty and degraded, it could have
undetectable data corruption. This is because the fact that it is
'dirty' means that the parity cannot be trusted, and the fact that it
is degraded means that some datablocks are missing and cannot reliably
be reconstructed (due to no parity).
For this reason, md will normally refuse to start such an array. This
requires the sysadmin to take action to explicitly start the array
despite possible corruption."
[^] # Re: Fiabilité / rapidité
Posté par Sébastien Koechlin . En réponse au message raid. Évalué à 2.
Oui, j'ai des sources, dans /usr/src/linux//Documentation/md.txt
Degraded = il manque un disque
Dirty = arrêt brutal
Le cas classique c'est la coupure de courant avec la défaillance d'un disque (l'un entrainant l'autre).
"If a raid5 or raid6 array is both dirty and degraded, it could have
undetectable data corruption. This is because the fact that it is
'dirty' means that the parity cannot be trusted, and the fact that it
is degraded means that some datablocks are missing and cannot reliably
be reconstructed (due to no parity).
For this reason, md will normally refuse to start such an array. This
requires the sysadmin to take action to explicitly start the array
despite possible corruption."