When Data ONTAP needs to update the labels (for instance, upon adding a disk to an aggregate or when changing the state of an aggregate), it will write every label 1 out to participating disks in the ...When Data ONTAP needs to update the labels (for instance, upon adding a disk to an aggregate or when changing the state of an aggregate), it will write every label 1 out to participating disks in the aggregate, read every label back, and if the results match Data ONTAP will then do the same for label 2. The error means that the storage layer claimed to read and write to the disk without any problems, however the label that ONTAP read back does not match the label it wrote.