我看到了有关如何删除软件 raid 的说明，其中一些包含以下两个说明：wipefs -af <device>和mdadm --zero-superblock --force <device>。
是否需要同时使用两者？它们的结果有何不同？
这里我创建了 /dev/sda3 和 /dev/sdb3 的 raid。我做了一个小测试，结果看起来是一样的。
machine1:~# wipefs /dev/sda3 # <-- see the signature on sda3
offset type
----------------------------------------------------------------
0x1000 linux_raid_member [raid]
LABEL: machine1:md_system
UUID: 54f255a8-c32d-2a67-f728-151f89a7471b
machine1:~# wipefs -af /dev/sda3 # <-- wipe signature using wipefs
/dev/sda3: 4 bytes were erased at offset 0x00001000 (linux_raid_member): fc 4e 2b a9
machine1:~# wipefs /dev/sda3 # <-- as you can see, signature was erased
machine1:~#
machine1:~# wipefs /dev/sdb3 # <-- see signature on sdb3
offset type
----------------------------------------------------------------
0x1000 linux_raid_member [raid]
LABEL: machine1:md_system
UUID: 54f255a8-c32d-2a67-f728-151f89a7471b
machine1:~# mdadm --misc --zero-superblock --force /dev/sdb3 # <-- wipe signature using mdadm
machine1:~# wipefs /dev/sdb3 # <-- as you can see, signature was also erased
machine1:~#
答案1
两条指令都导致归零这超级块，这意味着删除签名这里的文件系统元数据有关袭击。