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Problem with RAID. System not booting. Multiple disks showing Foreign.

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I have a server with an H700 controller. This morning the server went down and it won't boot. There is one VD which was configured as RAID 6 with a hot spare. Looking at the Physical Disks I can see the hot spare is offline, there are three disks showing as Foreign and the remaining two disks are Online. Since the system is not booting and there are multiple disks showing Foreign my plan is to import the Foreign config.

Does this seem like a good plan? Any other options?RAID6.jpg

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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Importing the foreign config would be necessary to bring the array back online and is perfectly safe in most all cases. I would recommend confirming that the drives are all otherwise health (not predicted to fail), then import.

#Iwork4Dell

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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Importing the foreign config would be necessary to bring the array back online and is perfectly safe in most all cases. I would recommend confirming that the drives are all otherwise health (not predicted to fail), then import.

#Iwork4Dell

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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When I go to import the foreign config I get a warning about Offline disks. Since there is an offline disk I canceled the foreign config import and went to force the disk online. I then get a warning about data corruption if I force the disk online.

Should I force the disk online first or just import the foreign config?Import_Warning.JPGForce_disk_online_warning.JPG

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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Hi,

 

In foreign view, does the virtual disk properties as expected it is? 

 

The prompt when import foreign isn't on offline disk but offline virtual disk. So, it's better to confirm in foreign view, the configurations are as what you have configured, then import foreign. 


Thanks,
Joey Chong
Dell EMC Enterprise Support Services
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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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Thank you for clarifying the foreign config import warning is for offline virtual disk. The foreign config does look correct. Unfortunately the virtual disk in my foreign config is showing offline. Does this mean I won't be able to import the foreign config? What should I do next?

Foreign_Config_Virtual_Disk_Offline.jpg

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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Hi,

 

The screenshot that you have, seems to be in VD Mgmt view. It should be showing virtual disk offline as there is foreign config. Can you proceed to Foreign View and import it, once you have confirmed the configuration is correct. 


Thanks,
Joey Chong
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPro

Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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You are right that screenshot was from the wrong menu. I was able to import the foreign config from foreign view. I did get an error during the import but the good news is I have three disks online now and one rebuilding. I am going to wait for the disk to finish rebuilding and try to boot.Rebuild.JPGForeign_Config_Import_Failed.JPG

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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If the array won't import, you'll need to look at restoring from backup. The controller log might specify why the import fails, but we won't have a way to do anything about it. 

 

Now there is another approach you can take. You can delete the array and lay down another with identical parameters and choose to *NOT* initialize. The initialization is what begins the blanking of the data blocks. I'd check on PD0 and confirm it's state, then move forward.

#Iwork4Dell
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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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I was thinking I should be ok at this point. This is a RAID 6 setup and one of the disks was used as a hotspare. I think PD0 was hotspare. So the VD should be able to run with a minimum of 3 disks. Additionally the controller appears to be rebuilding PD1 which must be possible using the parity from the 3 online disks. 

I am going to let PD1 finish rebuilding before booting to the operating system. If I can boot to the operating system I will clear the foreign config on PD5.

 

 

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Re: Problem with RAID. System not booting. Multiple disks showing Foreign.

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I'd agree with that gameplan. Letting the rebuild complete isn't going to cost anything but time at the worst case, and if it pays off, save a fair amount.

#Iwork4Dell
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