Proxmox iSCSI target with Synology NAS shared storage and troubleshooting

If you are using Proxmox in your home lab environment and you have a SAN or NAS running iSCSI, you can attach this shared storage to your Proxmox node. In this video, we take a look at adding Synology iSCSI shared storage to Proxmox and see how this can be done. We also look at troubleshooting iSCSI storage in Proxmox.

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Introduction to Synology NAS and Proxmox iSCSI LUNs! - 0:00
Beginning the setup of the iSCSI target on the Synology NAS - 1:02
Creating the new iSCSI target - 1:45
Creating the iSCSI LUN - 2:06
Viewing the summary screen of the iSCSI target creation process - 2:51
Setting the allow multiple sessions and selecting the network adapter used - 3:13
Verifying the network configuration for the iSCSI connectivity from Proxmox to Synology - 4:35
Additional network adapter for iSCSI traffic - 4:50
Verifying routing and Layer 2 connectivity with iSCSI - 5:45
SSH'ing into your Proxmox node verifying IP addresses and running traceroute - 6:17
Proceeding with iSCSI configuration in Proxmox - 7:15
Adding the connection to the Synology NAS from Proxmox - 7:27
Describing using LVM over iSCSI - unchecking the use LUNs directly - 8:25
Adding the LVM device on top of the iSCSI connection - 8:57
Synology LUN listed - 10:00
Creating a test VM to use the new Synology iSCSI LUN storage - 10:30
Troubleshooting iSCSI connections in Proxmox - 10:56
Using the ping command and the traceroute command review - 11:15
Errors when adding and removing LUNs in Proxmox - 11:33
Concluding thoughts on iSCSI LUNs on Proxmox - 12:20

Take a look at the write up of the process here:

[YoungfolkKnits]

Great information! Thanks for imparting your knowledge on iSCSi while giving my eyes something to SCSi 🤓

[symosys]

Thank you for posting this. i have ISCI lun on a Synology which was attached to my old Intel Mac mini so we could share the old iPhoto libraries. This required licensed software which I have but Mac OS no longer supports. I have a Proxmox cluster so can now try to get access to the files.

[BillMac]

I'd love to see you do an episode on multipath with iSCSI and 2 Proxmox nodes.

[ulriceriksson]

Thank you, finally I get it! I couldn't connect the dots between getting the iscsi lun onto the Proxmox host, and allowing the host to actually use it for anything. Creating the LVM storage on top of the iscsi storage was the missing link.

[RonGabriel]

very helpful thank you. am I the only that noticed the doggo in the backround? lol

[resonanceofambition]

Instead of messing around with VLANs and such, since I'm not that far yet, would it be okay to just connect the second port of my Synology NAS to a secondary port on my Proxmox blade? As far as I know I'm fully VLAN capable (HP DL360 g9, HP j9980a layer 2 switch) but I just want to avoid complex stuff as much as I can because this network isn't just a homelab, it's also what I use when coming back home from work tired to watch some series and such. Don't want too many abstraction layers hindering peace and tranquillity after work.

Edit: It seems to work. Important is the "Line of sight" and making sure that both devices are on the same network.

[jimholloway]

I was finally able to do this, I did not realize I needed a 2nd nic connection and was trying to do this with the single nic on my Lenovo M900 tiny, but I was able to plug in a usb-nic adapter and was able to get the 2nd connection and then the rest of your steps worked great. Is there anyway to not add a 2nd nic ?? THANK YOU so much, I was trying a couple things but I think you got me going in the right direction now, I will know tomorrow when I have more time to really test this.

[mzambo]

Great helpful video. I m using NFS with the Synology. Thank you

[dimitristsoutsouras]

Adding the iscsi in proxmox has the bug you mentioned. Nothing is using the volume you either wait or delete and recreate or reboot and you ll see the iscsi appear in the gui.

[fcodxdart]

Is there a way to scan the target to find newly created LUNs? I had to restart the host to get the new LUN to show up.

[IbrahimALMashaleh-gsit]

Hi there I have the same setup with clustered 4 nodes ; 2 can see the lvm and 2 are not, can you support in troubleshooting this case ? thanks in advance.

[ipstacks]

You didn't mention you have separate layer 2 networks, one for iscsi and one for other network stuff. I just happen to notice your iscsi interface was set to jumbo frames and your other network interface was at 1500. I was just thinking that was worth a mention. Also pictures say a lot when you are explaining networking, but it's your video and not mine. In proxmox maybe they are separate bridges connected to separate switches or directly attached to the SAN. Either way you must be using separate physical interfaces as you leave the proxmox box.

[atem]

To have it working, I had to login in SSH and apt install open-iscsi.

You can verify if it's the issue for you with pvesm status

[Foars]

what's the reason why we don't use LUNs directly?

[Piotr_T]

Hello. Is that possible to expand synology storage by mounting nfs or iscsi target on proxmox/truenas?

[joestillwell]

When I tried setting this up I saw three disks instead of one also. Installing multipath didn't work for me. I had to disable ipv6 on the Synology NIC that I dedicated to iSCSI and that resolved things for me. Just thought I would share in case anyone is having a similar problem.

[ozb]

hi can you show how to do pci passthrough on a hba card?

[antenehasnake]

Does Promox support SAN FC Interfaces and Storgae Mapping, If So kindly provide links.

[TheRealWattsie]

Just my $0.10, I came across the same "already used by volume" error, I simply used "wipefs --all --backup /dev/sda" then was able to create lvm.