Hello all, This may not be oVirt specific (but it may be) so thank you in advance for any assistance. I have a system installed with oVirt Node Next 4.1.9 that was installed to /dev/sda I had a seperate RAID Volume /dev/sdb that should not have been used, but now that the operating system is loaded I'm struggling to get the device partitioned. I've tried mkfs.ext4 on the device and also pvcreate, with the errors below. I've also rebooted a couple times and tried to disable multipathd. Is multipathd even safe to disable on Node Next? Below are the errors I've received, and thank you again for any tips. [root@node1-g6-h3 ~]# mkfs.ext4 /dev/sdb mke2fs 1.42.9 (28-Dec-2013) /dev/sdb is entire device, not just one partition! Proceed anyway? (y,n) y /dev/sdb is apparently in use by the system; will not make a filesystem here! [root@node1-g6-h3 ~]# gdisk GPT fdisk (gdisk) version 0.8.6 Type device filename, or press <Enter> to exit: /dev/sdb Caution: invalid main GPT header, but valid backup; regenerating main header from backup! Caution! After loading partitions, the CRC doesn't check out! Warning! Main partition table CRC mismatch! Loaded backup partition table instead of main partition table! Warning! One or more CRCs don't match. You should repair the disk! Partition table scan: MBR: not present BSD: not present APM: not present GPT: damaged Found invalid MBR and corrupt GPT. What do you want to do? (Using the GPT MAY permit recovery of GPT data.) 1 - Use current GPT 2 - Create blank GPT Your answer: 2 Command (? for help): n Partition number (1-128, default 1): First sector (34-16952264590, default = 2048) or {+-}size{KMGTP}: Last sector (2048-16952264590, default = 16952264590) or {+-}size{KMGTP}: Current type is 'Linux filesystem' Hex code or GUID (L to show codes, Enter = 8300): 8e00 Changed type of partition to 'Linux LVM' Command (? for help): w Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING PARTITIONS!! Do you want to proceed? (Y/N): y OK; writing new GUID partition table (GPT) to /dev/sdb. The operation has completed successfully. [root@node1-g6-h3 ~]# pvcreate /dev/sdb1 Device /dev/sdb1 not found (or ignored by filtering).