On Tue, Dec 06 2016, Artur Paszkiewicz wrote: > The PPL signature is used to determine if the stored PPL is valid for a > given array. With IMSM, the PPL signature should match the > orig_family_num field of the superblock. To avoid passing this value > from userspace, it can be read from the IMSM MPB when initializing the > log. It is up to mdadm to determine if the PPL is valid. It would only tell the kernel that a PPL exists if it is valid... NeilBrown
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