blkid反馈的uuid和mdadm.conf文件中记录的uuid 的值不一样

参考自:

"blkid" and "mdadm" Contain Different Value and Format of UUID for the Same Device (文档 ID 1988868.1)

不一致的原因如下:

UUID mentioned in blkid is an identity for filesystem on the md block device while the one in /etc/mdadm.conf identify the md block device itself. 
UUID of blkid is stored in filesystem structure (consistent with fstab)
 and it helps in uniquely identifying the filesytem among the available filesystems on the system, 
while uuid of mdadm.conf resides in the device metadata and helps the md subsystem identify that particular RAID device uniquely. 
In particular, it helps identify all the block devices that belong to the RAID array. 
Difference of UUID also exists for raid array, device, partition, LVM,PV, VG etc.