On Sun, Jul 12, 2020 at 08:59:32PM +0100, Matthew Wilcox wrote: > On Mon, Jul 13, 2020 at 03:40:39AM +0800, Austin Chang wrote: > > + # When using dmsetup directly instead of volume manager like lvm2, > > + # the first 4k of the metadata device should be zeroed to indicate > > + # empty metadata. > > + dd if=/dev/zero of=/dev/mapper/metadata bs=4k conv=notrunc > > ... don't you need 'count=1' or you'll zero the entire device? Oops, I copied the command I just used since zeroing the whole metadata device didn't harm. But 'count=1' should match what I've just written. I will send a v2 patch later
