我的raid5磁盘有问题。 我已经有磁盘故障，并没有任何问题更换磁盘，但这次我很难修复它。
这是情况：我正在运行Ubuntu 12.04。 我有3x2TB磁盘。 我有2 raid5磁盘md0和md1。 md0工作正常。 我遇到了问题，因为现在在降级模式下工作的md1作为sdc2而不是数组的一部分了。 但sdc没有死，因为sdc1是md0的一部分，工作正常。
$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1 : active raid5 sdb2[3] sdd2[2] 409336832 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU] md0 : active raid5 sdc1[4] sdb1[5] sdd1[3] 3497163776 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: <none> 关于/ dev / md1的细节如下：
$ sudo mdadm --detail /dev/md1 /dev/md1: Version : 1.2 Creation Time : Mon Aug 22 14:17:57 2016 Raid Level : raid5 Array Size : 409336832 (390.37 GiB 419.16 GB) Used Dev Size : 204668416 (195.19 GiB 209.58 GB) Raid Devices : 3 Total Devices : 2 Persistence : Superblock is persistent Update Time : Wed Dec 28 08:17:51 2016 State : clean, degraded Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Name : serv1:1 (local to host serv1) UUID : bf2095af:69c02451:1f31ee06:93b92c8b Events : 844 Number Major Minor RaidDevice State 0 0 0 0 removed 3 8 18 1 active sync /dev/sdb2 2 8 50 2 active sync /dev/sdd2
尝试从/ dev / sdc2中使用sudo mdadm /dev/md1 -r /dev/sdc2 mdadm: hot remove failed for /dev/sdc2: No such device or address sudo mdadm /dev/md1 -r /dev/sdc2给我下面的mdadm: hot remove failed for /dev/sdc2: No such device or address ，意味着/ dev / sdc2不再属于该数组。
但是当试图使用sudo mdadm /dev/md1 -a /dev/sdc2将/ dev / sdc2添加到arrays时，它给了我以下错误mdadm: add new device failed for /dev/sdc2 as 4: Invalid argument 。 我注意到，当试图添加sdc2时，我有一堆像这样login在/var/log/syslog ：
ata3.00: exception Emask 0x0 SAct 0x4000000 SErr 0x0 action 0x0 ata3.00: irq_stat 0x40000008 ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/08:d0:08:88:76/00:00:d0:00:00/40 tag 26 ncq 4096 in res 41/40:00:09:88:76/00:00:d0:00:00/40 Emask 0x409 (media error) <F> ata3.00: status: { DRDY ERR } ata3.00: error: { UNC } ata3.00: configured for UDMA/133 ata3: EH complete ata3.00: exception Emask 0x0 SAct 0x8000000 SErr 0x0 action 0x0 ata3.00: irq_stat 0x40000008 ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/08:d8:08:88:76/00:00:d0:00:00/40 tag 27 ncq 4096 in res 41/40:00:09:88:76/00:00:d0:00:00/40 Emask 0x409 (media error) <F> ata3.00: status: { DRDY ERR } ata3.00: error: { UNC } ata3.00: configured for UDMA/133 ata3: EH complete ata3.00: exception Emask 0x0 SAct 0x10000000 SErr 0x0 action 0x0 ata3.00: irq_stat 0x40000008 ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/08:e0:08:88:76/00:00:d0:00:00/40 tag 28 ncq 4096 in res 41/40:00:09:88:76/00:00:d0:00:00/40 Emask 0x409 (media error) <F> ata3.00: status: { DRDY ERR } ata3.00: error: { UNC } ata3.00: configured for UDMA/133 sd 2:0:0:0: [sdc] Unhandled sense code sd 2:0:0:0: [sdc] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE sd 2:0:0:0: [sdc] Sense Key : Medium Error [current] [descriptor] Descriptor sense data with sense descriptors (in hex): 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 d0 76 88 09 sd 2:0:0:0: [sdc] Add. Sense: Unrecovered read error - auto reallocate failed sd 2:0:0:0: [sdc] CDB: Read(10): 28 00 d0 76 88 08 00 00 08 00 end_request: I/O error, dev sdc, sector 3497429001 Buffer I/O error on device sdc2, logical block 1 ata3: EH complete
我不明白我需要做什么。 因为看起来我的sdc磁盘已经死了，而我完全没有使用/dev/sdc1 /dev/md0问题。 我已经试图阻止md1，然后用sudo mdadm --assemble /dev/md1 /dev/sdb2 /dev/sdd2 。 但是添加sdc2总会给出同样的问题。
这是我用sudo smartctl -a /dev/sdc2 ：
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 188 188 051 Pre-fail Always - 81654 3 Spin_Up_Time 0x0027 175 174 021 Pre-fail Always - 4250 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 33 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0 9 Power_On_Hours 0x0032 086 086 000 Old_age Always - 10611 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 33 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 22 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 19 194 Temperature_Celsius 0x0022 119 106 000 Old_age Always - 28 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
以下是我用sudo badblocks /dev/sdc2获得的sudo badblocks /dev/sdc2 ：
4 5 6 7