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I've exhausted my limited knowledge of Ubuntu and RAID setups but have had no luck putting my array back together.

In short, my RAID-5 setup consisted of four 2TB hard drives put together in RAID-5 in Ubuntu (mdadm I believe). So there's a total of 6.0TB of usable space (1 "spare").

The problem started recently when I had to move my server and when I tried to turn it back on. The machine wouldn't post and after messing with it (taking out the raided hard drives, leaving only a 250GB boot drive) and removing a PCI-E USB 3.0 card, it finally turned on. It turns out the PCI-E card was giving me problems booting. FYI the server is running ubuntu server with the desktop GUI on top.

When I finally was able to get the machine up and running, the fourth drive, /dev/sde was no longer connected to the array and the array was shown as degraded. I tried to repair and after waiting 6-8 hours, it was "clean," but I could not mount the array.

TL;DR - Something happened to my array. One drive seemed to have disconnected itself and now I can't put it back together and mount it to access my files.

My question is: how can I put my raid back together with just the 3 drives or the 4th to have it be complete again?

I would greatly appreciate any help in putting this back together! (There's a ton of data I would sorely miss). Thank you!

raid5.png 138k .png file
I deleted the raid and tried to piece it back together, no luck.

Screenshot-2.0 TB Hard Disk (ATA SAMSUNG HD204UI) [-dev-sdb] — Disk Utility.png 147k .png file
The first of three drives still associated with my 'nexus raid' array.

Screenshot-2.0 TB Hard Disk (ATA SAMSUNG HD204UI) [-dev-sde] — Disk Utility.png 163k .png file
The drive that's no longer associated.
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quad core madness
(14 items)
 
  
CPUMotherboardGraphicsRAM
Lapped Intel Core 2 Quad - Q6600 G0 Stepping Asus P5K Deluxe WiFi ATi Sapphire HD 6950 2GB Unlocked 8GB G.Skill Pi Black DDR2-800 PC2-6400 
Hard DriveOptical DriveOSMonitor
60GB OCZ Solid 2 SSD Samsung SATA 18X DVD Burner Windows 7 Ultimate x64 Dell 3007WFP-HC + 2x 2007FP in PLP 
KeyboardPowerCaseMouse
Ducky Shine Blue, MX Red Corsair HX620 620W Lian Li V1000 Plus Black Razer Mamba 2012 
Mouse PadAudio
XTrack Ripper XL Creative X-Fi XtremeMusic 
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Reply