I'm building a system with two Apple RAIDs attached. I have hardware RAID5 configured so no RAIDZ or RAIDZ2, just a basic zpool pointing at the four LUNs representing the four RAID controllers. For on-going maintenance, will a zpool scrub be of any benefit? From what I've read with this layer of abstration ZFS is only maintaining the metadata and not the actual data on the drives. What's the best practice to keep the data healthy? (scrub, import/export, etc..) Also, where are the replicas of the metadata stored in this configuration? Can that be backed up?
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