Without having OMSA installed on the server, I believe that you have 3 options 
to recreate the vdisk.  You can either use the iDRAC and go to the Storage > 
Virtual Disks and section and select the Create tab.   This page should allow 
you to create the vdisk.

The other option is to go in through the LC and drill into the storage section 
to create the vdisk. This is my least favorite option.

Lastly, you could use the CRTL-R option during boot to open the Raid Controller 
setup page to re-create the vdisk.

Personally, I've had very good luck using the omsa tools and perform this 
function right from the linux command line.

Best Regards,

-----Original Message-----
From: linux-poweredge-boun...@dell.com 
[mailto:linux-poweredge-boun...@dell.com] On Behalf Of Tim Mooney
Sent: Wednesday, August 9, 2017 6:15 PM
To: linux-poweredge@dell.com
Subject: [E] [Linux-PowerEdge] replacing a failed hard drive with PERC HBA mode

Hi All!

I need to replace a hard drive in a Dell R720 that's running RHEL 6.9.
The problem is that the replacement drive shows up as "Ready" in the physical 
disks area of iDRAC, instead of "Online".  It does not automatically show up as 
a vdisk in the virtual disks area.

The PERC H710 mini is in HBA mode, not RAID mode, so it's not handling the 
mirroring.  That's being done at the OS level with Linux's mdadm.

This hard drive is part of an mdadm RAID1.  The drive failed completely, so 
mdadm failed each of the partitions out of the individual MD devices.
I removed the failed MD components and then forced the OS to forget about 
/dev/sdb, with

        # echo 1 > /sys/block/sdb/device/delete

I pulled the failed hard drive from the hot-swap bay, installed the Dell 
replacement drive in the carrier, and inserted the replacement hard drive into 
the bay.  The drive LED blinked and went green, and iDRAC shows the physical 
disk as "Ready", instead of "Online", and the replacement is missing completely 
from the vdisk area.

The OS did not auto-detect a hard drive being added to the bus, and even a 
rescan via

        # echo '- - -' > /sys/class/scsi_host/host0/scan

does not trigger it to recognize the replacement drive is there.  I'm guessing 
that's because I need to do something at the PERC/iDRAC/Lifecycle level to get 
the drive to switch to "Online" and make it a vdisk.

How do I go about doing that?

We do not currently have any Dell OS-level RPMs installed, so no omsa or 
srv-admin or whatever.  After being on this list for a couple of years, my 
confidence in those tools is extremely limited.

It seems like 'megaclisas' might be able to help, but I have been completely 
unable to find a working link to that tool, after the
LSI->Avago->Broadcomm transition.  If anyone has a working link to get
it, I would appreciate seeing it.

Could 'racadm' via ssh perform the necessary magic to get this drive so that 
the PERC is presenting it as a disk to the OS?  Is there something easier than 
that, that also doesn't require a huge mess of questionable Dell RPMs be 

Any suggestions are much appreciated,

Tim Mooney                                             tim.moo...@ndsu.edu
Enterprise Computing & Infrastructure                  701-231-1076 (Voice)
Room 242-J6, Quentin Burdick Building                  701-231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164

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