I have a RAID6 array managed by LSI 9286-8e card. I also have Sans Digital 24-bay NexentaSTOR JBOD enclosure with SAS extender built-in. They are connected to separate UPS devices. Normally, I'd shut down the PC, leaving RAID6 in healthy state. But today the power to JBOD enclosure was cut but PC kept running.

After restarting the PC, all disks in RAID6 have lit up RED, and the only option in LSI MegaRAID manager app was to reset each disk to unassigned, thereby loosing all data on RAID6 array. Thankfully, I am only testing, but how would I recover if this were to happen in production?

  • 2
    I would call LSI - lsi.com/channel/contact/pages/support.aspx – joeqwerty Dec 8 '12 at 3:06
  • There's a toll free support phone number at the link I posted in my comment. If it were me I would call them rather than waiting for an answer here. – joeqwerty Dec 8 '12 at 3:58
  • Why are you using a hardware RAID controller with NexentaStor? – ewwhite Dec 8 '12 at 16:08
  • @ewwhite I am using only the expansion box from NexentaSTOR, not using the actual storage appliance. It seems LSI MegaRAID is really fast in handling RAID6, and speed matters in this application. I have not used NexentaSTOR appliance. Do you think I should? – GregC Dec 8 '12 at 16:11
  • What OS are you running? Is this a ZFS-based OS? – ewwhite Dec 8 '12 at 16:16

I managed to figure this out... I had to import foreign configuration from the drives.

  1. Right-click on each RED drive in array and change its state from Unconfigured Bad to Unconfigured Good: enter image description here

  2. Select Scan Foreign Configuration from controller's context menu: enter image description here

  3. It asks you a question... Pretty useless IMHO, but it works nonetheless: enter image description here

    3a. If advanced option is selected, it shows preview of configuration to import (note Foreign labels on all disks that were turned off in untimely fashion): enter image description here

  4. Agree, and we're back! enter image description here

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