Problem with LVM over iSCSI

[lyoleek]

Hi.
I have a Proxmox VE cluster of 3 nodes. It worked perfectly well for quite a while. But the other day I accidentally removed an LVM that had been created on iSCSI. And now I cannot get it back. I still have an iSCSI storage, so can see my iSCSI target. But when I try to add an LVM via GUI and choose my Base storage, I do not see any Base volume in the corresponding drop list.
I have already looked through a number of topics like "proxmox iscsi cannot see lun" but unfortunately with no luck. So how can I get my LVM back?

# pveversion
pve-manager/8.4.1/2a5fa54a8503f96d (running kernel: 6.8.12-10-pve)

# iscsiadm -m session
tcp: [1] 10.3.16.90:3260,1 iqn.2000-01.com.synology:Syn814RP.Target-1.5db9ac4dc96 (non-flash)

#lsscsi
[0:0:0:0]    cd/dvd  Optiarc  DVD RW AD-7760H  1.41  /dev/sr0
[2:2:0:0]    disk    LSI      RAID SAS 6G 0/1  2.12  /dev/sda
[3:0:0:1]    disk    SYNOLOGY Storage          4.0   /dev/sdb
[4:0:0:1]    disk    SYNOLOGY iSCSI Storage    4.0   /dev/sdc

# lsscsi
[0:0:0:0]    cd/dvd  Optiarc  DVD RW AD-7760H  1.41  /dev/sr0
[2:2:0:0]    disk    LSI      RAID SAS 6G 0/1  2.12  /dev/sda
[3:0:0:1]    disk    SYNOLOGY Storage          4.0   /dev/sdb
[4:0:0:1]    disk    SYNOLOGY iSCSI Storage    4.0   /dev/sdc
root@pve0:/etc/pve# lsblk
NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda                         8:0    0 278.9G  0 disk
├─sda1                      8:1    0  1007K  0 part
├─sda2                      8:2    0     1G  0 part
└─sda3                      8:3    0 277.9G  0 part
  ├─pve-swap              252:0    0     8G  0 lvm  [SWAP]
  ├─pve-root              252:1    0  79.5G  0 lvm  /
  ├─pve-data_tmeta        252:2    0   1.7G  0 lvm 
  │ └─pve-data            252:4    0 170.9G  0 lvm 
  └─pve-data_tdata        252:3    0 170.9G  0 lvm 
    └─pve-data            252:4    0 170.9G  0 lvm 
sdb                         8:16   0   5.9T  0 disk
├─group1-vm--108--disk--0 252:5    0     4M  0 lvm 
├─group1-vm--108--disk--1 252:6    0   320G  0 lvm 
├─group1-vm--108--disk--2 252:7    0     4M  0 lvm 
├─group1-vm--109--disk--0 252:8    0   500G  0 lvm 
├─group1-vm--112--disk--0 252:9    0     1T  0 lvm 
├─group1-vm--113--disk--0 252:10   0    40G  0 lvm 
├─group1-vm--114--disk--0 252:11   0    16G  0 lvm 
├─group1-vm--100--disk--0 252:12   0   256G  0 lvm 
├─group1-vm--103--disk--0 252:13   0    64G  0 lvm 
├─group1-vm--106--disk--0 252:14   0   240G  0 lvm 
├─group1-vm--104--disk--0 252:15   0   160G  0 lvm 
├─group1-vm--107--disk--0 252:16   0   160G  0 lvm 
├─group1-vm--101--disk--0 252:17   0    64G  0 lvm 
├─group1-vm--115--disk--0 252:18   0     4M  0 lvm 
├─group1-vm--115--disk--1 252:19   0   320G  0 lvm 
└─group1-vm--115--disk--2 252:20   0     4M  0 lvm 
sdc                         8:32   0   5.9T  0 disk
sr0                        11:0    1  1024M  0 rom

As I can see, /dev/sdb contains all my VM-disks. But I cannot put my finger on what I should do to see all of them in the GUI. Any help will be appreciated.

 

[bbgeek17]

Adding LVM via GUI means actually creating an LVM structure. You can't do it as you don't have available empty disks - there is already an LVM there.
You need to create an entry in your /etc/pve/storage.cfg that points to your existing VG group.

First, examine your LVM structure:
pvs
vgs
lvs

Next, create the storage pool:
pvesm add lvm [lvm_pool_name] --base [iscsi_pool] --vgname [group1]

Examine the configuration of one of your VM to learn what the LVM pool should be called: qm config [vmid]

Good luck

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[lyoleek]

Adding LVM via GUI means actually creating an LVM structure. You can't do it as you don't have available empty disks - there is already an LVM there.
You need to create an entry in your /etc/pve/storage.cfg that points to your existing VG group.

First, examine your LVM structure:
pvs
vgs
lvs

Next, create the storage pool:
pvesm add lvm [lvm_pool_name] --base [iscsi_pool] --vgname [group1]

Examine the configuration of one of your VM to learn what the LVM pool should be called: qm config [vmid]

Good luck

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thanks for your response. Yes, it does make sense. I will try to follow your advice. Thanks again and have a good day.