On Thu, Oct 25, 2012 at 2:25 AM, Jim Klimov <jimkli...@cos.ru> wrote:
> Hello all, > > I was describing how raidzN works recently, and got myself wondering: > does zpool scrub verify all the parity sectors and the mirror halves? > Yes. The ZIO_FLAG_SCRUB instructs the raidz or mirror vdev to read and verify all parts of the blocks (parity sectors and mirror copies). The math for RAID-Z is described in detail in the comments of vdev_raidz.c. If there is a checksum error, we reconstitue the data by trying all possible combinations of N incorrect sectors (N being the number of parity disks) -- see vdev_raidz_combrec(). --matt
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