I think I may have just messed up my cluster. I'm running an older 4.4.2.6 cluster on CentOS-8 with 4 nodes and a self-hosted engine. I wanted to assemble the spare drives on 3 of the 4 nodes into a new gluster volume for extra VM storage. Unfortunately, I did not look closely enough at one of the nodes before running sfdisk+parted+pvcreate, and now it looks like I may have broken my onn storage. pvs shows missing uuids: # pvs WARNING: Couldn't find device with uuid RgTaWg-fR1T-J3Nv-uh03-ZTi5-jz9X-cjl1lo . WARNING: Couldn't find device with uuid 0l9CFI-Z7pP-x1P8-AJ78-gRoz-ql0e-2gzXsC . WARNING: Couldn't find device with uuid fl73h2-ztyn-y9NY-4TF4-K2Pd-G2Ow-vH46yH . WARNING: VG onn_ovirt1 is missing PV RgTaWg-fR1T-J3Nv-uh03-ZTi5-jz9X-cjl1lo (l ast written to /dev/nvme0n1p3). WARNING: VG onn_ovirt1 is missing PV 0l9CFI-Z7pP-x1P8-AJ78-gRoz-ql0e-2gzXsC (l ast written to /dev/nvme1n1p1). WARNING: VG onn_ovirt1 is missing PV fl73h2-ztyn-y9NY-4TF4-K2Pd-G2Ow-vH46yH (l ast written to /dev/nvme2n1p1). PV VG Fmt Attr PSize PFree /dev/md2 vg00 lvm2 a-- <928.80g 0 /dev/nvme2n1p1 gluster_vg_nvme2n1p1 lvm2 a-- 2.91t 0 /dev/nvme3n1p1 onn_ovirt1 lvm2 a-- 2.91t 0 [unknown] onn_ovirt1 lvm2 a-m 929.92g 100.00g [unknown] onn_ovirt1 lvm2 a-m <931.51g 0 [unknown] onn_ovirt1 lvm2 a-m 2.91t 0 Here's what I don't understand: * This onn volume group only existed on one of the 4 nodes. I expected it would have been on all 4? * lsblk and /etc/fstab don't show any reference to onn * What is the ONN volume group used for, and how bad is it if it's now missing? I note that my VMs all continue to run and I've been able to migrate them off of this affected node with no apparent problems. * Is it possible that this onn volume group was already broken before I messed with the nvme3n1 disk? When ovirt was originally installed several years ago, I went through the install process multiple times and might not have cleaned up properly each time. --Mike