How often should a RAID consistency check be done? I have a LaCie 60TB RAID array. I've had it for a couple of years, but I am wondering how often I should do a &quot;Consistency Check&quot; on it. I don't know a whole lot about RAIDs. It's formatted HFS+, so I think this is a different than defragmenting. LaCie don't mention doing this as a routine in the section of the manual regarding the subject.
A RAID consistency check will verify all of the blocks in the volume so there will be  a significant hit to operational read/write  performance.  That means you want to run this test ideally during off hours.
That said, how often you run it will depend on  its use.   Typically, in an IT department with a typical file server and lots of reads and writes, a consistency check every week is advised.   If this is for archival access - more reads than writes - a less frequent consistency check is fine. On the other side of that coin, if it's a file server with more writes, you'll want to check it more often.
Three file system type really plays no bearing on it because the consistency is for the RAID array to ensure that it's consistent across the whole volume.