我们在树莓派上使用 RAID 1，似乎（从 /proc/mdstat 的输出来看）其中一个设备不见了：
mschnick@pi3:~ $ sudo cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1](F) sda1[2]
976629760 blocks super 1.2 [2/1] [U_]
bitmap: 8/8 pages [32KB], 65536KB chunk
unused devices: <none>
但是，fdisk 和 lsusb 中都存在“损坏”/故障的设备。在 smartctl 上检查后，它似乎也完好无损。
=== START OF READ SMART DATA SECTION ===
SMART Status not supported: Incomplete response, ATA output registers missing
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0
2 Throughput_Performance 0x0005 100 100 050 Pre-fail Offline - 0
3 Spin_Up_Time 0x0027 100 100 001 Pre-fail Always - 2988
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 25163
5 Reallocated_Sector_Ct 0x0033 100 100 050 Pre-fail Always - 0
7 Seek_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0
8 Seek_Time_Performance 0x0005 100 100 050 Pre-fail Offline - 0
9 Power_On_Hours 0x0032 077 077 000 Old_age Always - 9300
10 Spin_Retry_Count 0x0033 253 100 030 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 31
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 9
193 Load_Cycle_Count 0x0032 085 085 000 Old_age Always - 152088
194 Temperature_Celsius 0x0022 100 100 000 Old_age Always - 33 (Min/Max 22/50)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 253 000 Old_age Always - 0
220 Disk_Shift 0x0002 100 100 000 Old_age Always - 4101
222 Loaded_Hours 0x0032 092 092 000 Old_age Always - 3439
223 Load_Retry_Count 0x0032 100 100 000 Old_age Always - 0
224 Load_Friction 0x0022 100 100 000 Old_age Always - 0
226 Load-in_Time 0x0026 100 100 000 Old_age Always - 178
240 Head_Flying_Hours 0x0001 100 100 001 Pre-fail Offline - 0
因此，根据所有信息，似乎该驱动器可用，但 mdadm 无法接受该驱动器。
在网上搜索有用的信息没有成功，主要是因为我无法用简洁的语言表达问题。
我应该采取哪些后续措施？我是否必须更换驱动器，还是问题出在其他地方？
我很感激任何指明正确方向的建议。
迈克尔