我有一个 4 驱动器 Raid 5 阵列。其中一个驱动器 (sdb) 显示大量错误，并且我的阵列在访问期间显示高延迟。
我目前有一个新磁盘，另一个磁盘已被命令。
作为替换的一部分，我还想将 raid 级别从 raid 5 提升到 raid 6。我确定要实现这一点：
首先成长到 6 级
mdadm --manage /dev/md0 --add /dev/sdf1
mdadm --grow /dev/md0 --raid-devices 5 --level 6 --backup-file /<path>/mdadm-backup
mdadm --manage /dev/md0 --replace /dev/sdb1 # Set faulty but keep it for replacement until a spare drive is available
# After my second drive arrived
mdadm --manage /dev/md0 --add /dev/sdg1
首先更换故障驱动器，然后升级到 raid 级别 6
mdadm --manage /dev/md0 --add /dev/sdf1
mdadm --manage /dev/md0 --replace /dev/sdb1 --with /dev/sdf1
# after second drive is arrived
mdadm --manage /dev/md0 --add /dev/sdg1
mdadm --grow /dev/md0 --raid-devices 5 --level 6 --backup-file /path/mdadm-backup
这两种解决方案之间有区别吗？通过在阵列中对磁盘施加较少的操作，一种解决方案是否比另一种更安全？
[编辑] 添加智能结果：
Sdb（几乎有故障）
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 082 072 006 Pre-fail Always - 22562487
3 Spin_Up_Time 0x0003 093 093 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 124
5 Reallocated_Sector_Ct 0x0033 077 077 010 Pre-fail Always - 29352
7 Seek_Error_Rate 0x000f 087 060 030 Pre-fail Always - 4963671931
9 Power_On_Hours 0x0032 026 026 000 Old_age Always - 65627
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 124
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 4793
188 Command_Timeout 0x0032 100 072 000 Old_age Always - 137445703785
189 High_Fly_Writes 0x003a 001 001 000 Old_age Always - 107
190 Airflow_Temperature_Cel 0x0022 073 056 045 Old_age Always - 27 (Min/Max 25/28)
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 - 82
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 296
194 Temperature_Celsius 0x0022 027 044 000 Old_age Always - 27 (0 14 0 0 0)
197 Current_Pending_Sector 0x0012 001 001 000 Old_age Always - 35384
198 Offline_Uncorrectable 0x0010 001 001 000 Old_age Offline - 35384
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
安邦
1 Raw_Read_Error_Rate 0x000f 118 099 006 Pre-fail Always - 194860592
3 Spin_Up_Time 0x0003 093 093 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 124
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 24
7 Seek_Error_Rate 0x000f 087 060 030 Pre-fail Always - 654004767
9 Power_On_Hours 0x0032 026 026 000 Old_age Always - 65631
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 124
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 094 094 000 Old_age Always - 6
188 Command_Timeout 0x0032 100 099 000 Old_age Always - 2
189 High_Fly_Writes 0x003a 062 062 000 Old_age Always - 38
190 Airflow_Temperature_Cel 0x0022 073 059 045 Old_age Always - 27 (Min/Max 24/27)
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 - 82
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 295
194 Temperature_Celsius 0x0022 027 041 000 Old_age Always - 27 (0 14 0 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
安全数据表
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 113 094 006 Pre-fail Always - 51447952
3 Spin_Up_Time 0x0003 093 093 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 124
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 087 060 030 Pre-fail Always - 665278320
9 Power_On_Hours 0x0032 026 026 000 Old_age Always - 65630
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 124
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 173
188 Command_Timeout 0x0032 100 099 000 Old_age Always - 1
189 High_Fly_Writes 0x003a 001 001 000 Old_age Always - 188
190 Airflow_Temperature_Cel 0x0022 073 055 045 Old_age Always - 27 (Min/Max 25/27)
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 - 82
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 296
194 Temperature_Celsius 0x0022 027 045 000 Old_age Always - 27 (0 14 0 0 0)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 16
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 16
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0