RAID1 硬盘状态问题 是不是有一块硬盘掉线了？

Question

host:~# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda2[0]
      468752512 blocks [2/1] [U_]

md0 : active raid1 sda1[0]
      497856 blocks [2/1] [U_]

unused devices: <none>

这个是不是表示有一块硬盘掉线了？

dmesg的内容：

[    4.854062] md: raid1 personality registered for level 1
[    4.864974] md: md0 stopped.
[    4.870143] md: bind<sdb1>
[    4.870356] md: bind<sda1>
[    4.870379] md: kicking non-fresh sdb1 from array!
[    4.870386] md: unbind<sdb1>
[    4.870394] md: export_rdev(sdb1)
[    4.881655] raid1: raid set md0 active with 1 out of 2 mirrors
[    4.881655] md: md1 stopped.
[    4.905464] md: bind<sdb2>
[    4.905691] md: bind<sda2>
[    4.905717] md: kicking non-fresh sdb2 from array!
[    4.905724] md: unbind<sdb2>
[    4.905731] md: export_rdev(sdb2)
[    4.916905] raid1: raid set md1 active with 1 out of 2 mirrors

Answer 1

应该是掉了

Answer 2

组的是LVM+RAID1

Answer 3

不敢确定，求高手