[SOLVED] cannot create lvm on top of iscsi volume

[dlmw89]

Hello everyone,

I'm setting up a small proxmox cluster with three hosts and an HP P2000 ISCSI storage.
Everything works fine, the only problem is that I cannot create the LVM on top of the ISCSI lun.
I get the following error message in the Proxmox GUI:
create storage failed: error with cfs lock 'file-storage_cfg': pvcreate '/dev/disk/by-id/scsi-3600c0ff000d8c1a602afce1201000000' error: Cannot use device /dev/disk/by-id/scsi-3600c0ff000d8c1a602afce1201000000 with duplicates. (500)

I've installed the hosts today with the very latest Proxmox Version 6.1.3.


Has anyone seen this erro before?


Best Regards

Daniel

 

[Stoiko Ivanov]

create storage failed: error with cfs lock 'file-storage_cfg': pvcreate '/dev/disk/by-id/scsi-3600c0ff000d8c1a602afce1201000000' error: Cannot use device /dev/disk/by-id/scsi-3600c0ff000d8c1a602afce1201000000 with duplicates. (500)

seems you have multiple connections to the SAN - you need to setup mulitpath and use the mulitpath device as PV for the LVM

see the wiki-entry [0] on multipath - it's tailored towards iSCSI, but should also help if you're connecting via FC or SAS

I hope this helps!

[0] https://pve.proxmox.com/wiki/ISCSI_Multipath

 

[dlmw89]

Hello,

thank you for your fast reply.
Normally I would use multipath only when the system is aware that there are multiple connections to the target, like a typical FC or FCoE setup.
However in my case I'm using LACP bonding on the hosts and also LACP on the storage.

Rgardless, I'll try to use multipath and keep you updated.


Thanks

Daniel

 

[Stoiko Ivanov]

However in my case I'm using LACP bonding on the hosts and also LACP on the storage.

LACP is on a different layer and its use is independent of multipath..

the error-message you posted before is however most likely related to having multiple paths to the same device/LUN

the output of `lsblk` can help in those situations (also just installing mulitpath-tools and looking at the multipath -ll output)

 

[dlmw89]

Hello,

thank very much for your advice.
Due to the fact that I have a storage with dual active controllers, a "lsblk" and also a "pvesm scan iscsi x.x.x.x" showed that there are two identical disks and also one wwnn with two ips...

Installing multipath and running multipath -ll solved my problems!

Thanks Daniel

 

[Stoiko Ivanov]

Glad the issue got solved - please mark the thread as 'SOLVED' - it helps other users who are confronted with the same error-message

Thanks!