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Using a WD world book that stopped working after power cycle.

I can ssh into the machine and all disks report healthy so if I knew more about Linux I think this might be a quick fix. Figured I'd throw this this out to you experts and see what kind of learning experience I can make this into.

All data is backed up elsewhere so if we crash and burn I won't be mad at anyone, as I said this is more to broaden my mind. I've included lots of commands I read up on that might clue someone in as to where to go next.

And I'll try anything anyone wants to suggest to get md2 active so that things will work again, ideally without losing any data as pulling from the backup is going to be time consuming because its terabytes over a network.

How can I fix this?

/ # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] 
md2 : inactive sda4[0](S)
      973524992 blocks super 1.2

md1 : active raid1 sdb2[0] sda2[1]
      256896 blocks [2/2] [UU]

md3 : active raid1 sdb3[0] sda3[1]
      987904 blocks [2/2] [UU]

md0 : active raid1 sdb1[0] sda1[1]
      1959872 blocks [2/2] [UU]

unused devices: <none>

/ # fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1               1      121602   976762583+  ee  EFI GPT

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sdb1               1      121602   976762583+  ee  EFI GPT


/ # smartctl -d ata -a /dev/sda
smartctl version 5.38 [arm-unknown-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Device Model:     WDC WD10EARS-00MVWB0
Serial Number:    WD-WCAZA1917334
Firmware Version: 51.0AB51
User Capacity:    1,000,204,886,016 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Wed Dec 25 23:40:03 2013 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x84) Offline data collection activity
                    was suspended by an interrupting command from host.
                    Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0) The previous self-test routine completed
                    without error or no self-test has ever 
                    been run.
Total time to complete Offline 
data collection:         (23400) seconds.
Offline data collection
capabilities:            (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    Conveyance Self-test supported.
                    Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                    General Purpose Logging supported.
Short self-test routine 
recommended polling time:    (   2) minutes.
Extended self-test routine
recommended polling time:    ( 228) minutes.
Conveyance self-test routine
recommended polling time:    (   5) minutes.
SCT capabilities:          (0x3035) SCT Status supported.
                    SCT Feature Control supported.
                    SCT Data Table supported.

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     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   163   158   021    Pre-fail  Always       -       6850
  4 Start_Stop_Count        0x0032   083   083   000    Old_age   Always       -       17141
  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   075   075   000    Old_age   Always       -       18619
 10 Spin_Retry_Count        0x0032   100   100   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       -       25
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       18
193 Load_Cycle_Count        0x0032   150   150   000    Old_age   Always       -       152082
194 Temperature_Celsius     0x0022   097   084   000    Old_age   Always       -       53
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   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

/ # mdadm --examine /dev/sda4
/dev/sda4:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 40af53f3:1c6a19c7:d62e215c:505e27f1
           Name : Steamboat:2  (local to host Steamboat)
  Creation Time : Tue Nov  8 17:49:19 2011
     Raid Level : raid0
   Raid Devices : 2

 Avail Dev Size : 1947050943 (928.43 GiB 996.89 GB)
  Used Dev Size : 0
    Data Offset : 16 sectors
   Super Offset : 8 sectors
          State : active
    Device UUID : 26970e14:ff3faf9f:85ae9fae:5354f780

    Update Time : Tue Dec 24 17:33:46 2013
       Checksum : 6cbf47da - correct
         Events : 17

     Chunk Size : 512K

   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing)
/ # 
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