X-RAID2 lost redundancy - NV+ v2

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Reply from FramerV: mdstat.log: Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md2 : active raid5 sdb3[1] 2925544704 blocks super 1.2 level 5, 64k chunk, algorithm 2 [2/1] [_U] md1 : active raid1 sda2[0] sdb2[1] 524276 blocks super 1.2 [2/2] [UU] md0 : active raid1 sdb1[1] 4193268 blocks super 1.2 [2/1] [_U] unused devices: none disk_smart_2016_10_30: Device Model: WDC WD30EFRX-68AX9N0 Serial Number: WD-WMC1T1416147 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 1 Basically what this means is that the drive with the serial number WD-WMC1T1416147 has a pending sector. This is actually a sign of a hard drive failure. Looking at the mdstat, this caused it to fall out of the RAID; notice the letter "U" and underscores? Those represent your RAID, having an underscore there means that the drive is no longer participating in the RAID. This is why you are having a degraded error message.