> Umm. Isn't RAID implemented as the md device? That implies that it is
> responsible for some kind of error management. Bluntly, the file systems
> don't declare a file system kaput until they've retried the critical
> I/O operations. Why should RAID5 be any less tolerant?

File systems give up the moment they get an error. The actual device driver
does the retries. This is done because only the driver or things like the scsi
layer know about the right retry procedures for a given device - eg for a
smart raid controller retrying is done by the card

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