...

> >> If the RAID card scrubs its disks
> 
> A scrub without checksum puts a huge burden on disk
> firmware and  
> error reporting paths :-)

Actually, a scrub without checksum places far less burden on the disks and 
their firmware than ZFS-style scrubbing does, because it merely has to scan the 
disk sectors sequentially rather than follow a tree path to each relatively 
small leaf block.  Thus it also compromises runtime operation a lot less as 
well (though in both cases doing it infrequently in the background should 
usually reduce any impact to acceptable levels).

- bill
 
 
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