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Adding drives to two Dell R620s. One finds the drives, the other dosen't

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Last Modified: 2018-05-22
I have two Dell PowerEdge R620 Servers running Windows 2012. Added three new drives to the first. The plan was to create a new mirror drive and have the third disk as the hot spare. Server enclosure did not see them. This was a hot add while the server was powered on.

Attempted the same procedure on the second server and the drives were recognized and the new RAID was created without issue. The RAID card is a PERC H710 is the same on both servers. Same drivers and firmware between them as well.

I can reboot, but will have to wait till the weekend. But this is bothering me as the server is supposed to be able to add drives while running. And the second server confirms this is indeed possible.

Any ideas?
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IT Consultant
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Top Expert 2010
Commented:
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Author

Commented:
No they are not showing up at all in the Physical Disks in Open Manager.

I don't know about the second SAS cable for the backplane. Any easy way to tell?
PowerEdgeTechIT Consultant
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Commented:
Nope ... need to open the case to look.

Do the drives light up?

Author

Commented:
Yes, the drive do light up.
PowerEdgeTechIT Consultant
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Commented:
So, the backplane is functional (it is giving them power), so the question is whether or not there is a data connection for the drives to the controller.
John TsioumprisSoftware & Systems Engineer
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Commented:
Even if everything seems fine a minor misalignment can cause issues....i had an issue recently with my DAS....the replacement disk seemed fine but my FREENAS was not starting....fingers crossed i pulled the disk out and pushed it again a bit harder...everything went smoothly...
BUT i would advise against performing that on live server given the fact it didn't went well the 1st time....better power it down and try one disk at a time
PowerEdgeTechIT Consultant
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Commented:
You also can't do that on a server running RAID or everything will go offline and possibly end up with corrupted data. You would need to reseat while powered down and unplugged.
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PowerEdgeTechIT Consultant
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Commented:
Yes.

Author

Commented:
I opened the server up and checked the SAS cables. I did reseat the second cord as it did appear to be slightly loose. Power back up the drives were recognized right away. Thanks for the help.
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