Thank you so much Arman. With use of that command, I was able to restore 

I really appreciate the help

> On May 1, 2016, at 2:58 PM, Arman Khalatyan <> wrote:
> Hi, before to start target cli you should remove all lvm auto-imported 
> volumes:
> dmsetup remove_all
> Then restart your targetcli.
> Am 01.05.2016 1:51 nachm. schrieb "Clint Boggio" <>:
>> Greetings oVirt Family;
>> Due to catastrophic power failure, my datacenter lost power. I am using a 
>> CentOS7 server to provide ISCSI services to my OVirt platform.
>> When the power came back on, and the iscsi server booted back up, the 
>> filters in lvm.conf were faulty and LVM assumed control over the LVM's that 
>> OVirt uses as the disks for the VMs. This tanked target.service because it 
>> claims "device already in use" and my datacenter is down.
>> I've tried several filter combinations in lvm.conf to no avail, and in my 
>> search I've found no documentation on how to make LVM "forget" about the 
>> volumes that it had assumed and release them.
>> Do any of you know of a procedure to make lvm forget about and release the 
>> volumes on /dev/sda ?
>> OVirt 3.6.5 on CentOS 7
>> 4 Hypervisor nodes CentOS7
>> 1 Dedicated engine CentOS7
>> 1 iscsi SAN CentOS 7 exporting 10TB block device from a Dell Perc RAID 
>> controller /dev/sda with targetcli.
>> 1 NFS server for ISO and Export Domains 5TB
>> I'm out I ideas and any help would be greatly appreciated.
>> I'm currently using dd to recover the VM disk drives over to the NFS server 
>> in case this cannot be recovered.
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