Recovering data from a busted RAID5 array
Hi all,
I have been using a 4-disk RAID5 array using an Acer EasyStore NAS. As was inevitable - the device has failed and no longer recognizes the Array. I am Now attempting to back up the data from these drives. So far I have: Connected 3x of the 4 drives to SATA ports 0-3 on my motherboard. Booted a Knoppix LiveCD (latest version at time of this writing) Been able to see the drives in the file explorer as sda4, sdb4, sdc4 Google tells me I need to somehow restore the array using the MDADM command. But I have not been able to figure out the exact commands. Can anyone help? I am a complete newbie when it comes to Linux. Thanks Brett |
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Quote:
For some more information, see the results of fdisk -l: Code:
root@Microknoppix:/home/knoppix# fdisk -l Code:
root@Microknoppix:/home/knoppix# mdadm --assemble /dev/md0 /dev/sd[abcd]2 |
Recreate soft-raid array in linux
Can you try it like this auto detect devices?
There is really not much about recovering soft-raid on linux on internet and I don't have any idea whatsoever with it, sorry. Can anyone here at LQ please help out. wish you good luck |
When you say the "device" has failed, are you referring to the Acer NAS?
You may be able to RMA the NAS, and just put the drives in. It depends on how the NAS stores the array information...on most hardware RAID cards the array information is stored on the disks themselves, so you can swap out the controller and the array stays in-tact. Software RAIDs are a bit harder to recover in the event of a failure...unfortunately I don't have any experience with that (most of my systems are hardware RAID). |
Got it working!
Was just a matter of running the command from earlier with --force. Backing up to USB drive now. Thanks for the help! |
Great,
thanks for reporting back for future references that others may find this. |
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