Sthaug, We have 6 F330 here in Texas Instruments France, since 3 years. The question you are asking is the one that any Netapp sys_admin ask a day or an other. There is generaly no clear reply from NetApp support: I have been replied that up to 40 recoverable error per day is still acceptable. To me this is more than probable that a disk which has 40 recoverable error per day is a disk which will fail soon (within a month). I will never take the risk to let a disk slowly dying, because in the mean time an other can suddenly crash. This will cause the rebuilt of the filesystem on the spare disk, AND ACCELERATE THE DEATH OF THE FIRST DISK. IF THE FIRST DISK DEFENITIVELY DYE DURING THE REBUILT, THEN YOU ARE IN A BIG TROUBLE. THIS HAPPENG IN TIF, WE LOST 50GB OF DATA.
WE CONSIDER THAT 10 UNROCOVERABLE ERRORS PER DAY IS THE LIMIT. MORE THAT 10 I STRONGLY RECOMMEND TO FAIL THE DISK MANUALLY.