You can have it check the filesystem while it is online, by using "zpool scrub poolname" - it will go through and check all the ECC'd bits and then attempt to f

You can have it check the filesystem while it is online, by using "zpool scrub poolname" - it will go through and check all the ECC'd bits and then attempt to fix it if possible. You can then run "zpool status" and it will display the last time each pool was scrubbed, and show you the number of errors if any.