On Thu Jan 5 14:13:55 EST 2012, [email protected] wrote: > >> venti doesn't have a "scrub" command, does it? zfs scrub was > >> instrumental in warning me that I needed new disks. > > > > they're using coraid storage. all this is taken care of for them > > by the SR appliance. > > Out of curiosity, how? ZFS blocks are checksummed. ZFS scrub reads > not physical blocks on disks, but logical ZFS blocks and validates > their checksum. How can the Coraid appliance determine if the data it > reads is valid or not since it works below the file system layer and > only understands physical blocks?
all redundant raid types have parity (even raid 1; fun fact!). - erik
