Just diving into Proxmox from VMWare. I have create two iSCSI connectors to my Synology UC3200. Not sure how to use them as "redundant" connections so I created a Cluster using those links. I think this is wrong and now I don't know how to remove that cluster. Anyhow I tried creating a LVM but get an error. I can preface this with I didn't set the size of my Synology LUN and it was 1G. I fixed this then issued "iscsiadm --mode session --rescan" to fix the reported LUN size.
create storage failed: command '/sbin/pvs --separator : --noheadings --units k --unbuffered --nosuffix --options pv_name,pv_size,vg_name,pv_uuid /dev/disk/by-id/scsi-3600140533763436dbfedd4c20d9b20d6' failed: exit code 5 (500)
How do I make use of my two iSCSI connectors to my Synology LUN properly?
@clnx welcome to the forums! Great questions on Proxmox and iSCSI connections. First, take a look at my blog post on creating Proxmox iSCSI connections as I used a Synology NAS for this process as well: Proxmox iSCSI target to Synology NAS.
For multipathing, you will want to check out installing the package multipath-tools:
apt update apt install multipath-tools
Once you have the package installed, you will want to edit the configuration file located here:
nano /etc/multipath.conf
You can create a general configuration using something like the following example:
defaults {
user_friendly_names yes
find_multipaths yes
}
blacklist {
devnode "^sda"
}
devices {
device {
vendor "Synology"
product ".*"
path_grouping_policy group_by_prio
path_checker tur
rr_weight uniform
no_path_retry queue
failback immediate
}
}
After you create the configuration file, you will need to restart the multipathing configuration:
systemctl restart multipathd
Discover your iSCSI target by IP addresses:
iscsiadm -m discovery -t sendtargets -p <target_IP>
Log into each target session:
iscsiadm -m node --login
After logging into the IP addresses with the above command, make sure multipath devices are created using the command:
multipath -ll
You should see a multipath device (will see something like "mpatha", etc) that combines both iSCSI paths.
Take a look at this official documentation here as well from Proxmox: Multipath - Proxmox VE.
Thank you for putting the time into this. I actually found https://pve.proxmox.com/wiki/Multipath and followed that document before seeing your post. I had to resize my LVM as I had my Synology LUN set to 1G when it should have been 7T. So, I have a multi-path iSCSI to Synology with MTU 9216. Now I will try and create a new VM then try and import a VMWare VM. Creating the LVM was a bit confusing with the multi-path until realized I was still choosing a Base Storage when it should be skipped and simply choose the new Volume group.
@clnx that is awesome! Glad you are making great progress here. I am hoping in future UI we get some better tools to do the day-to-day storage maintenance and provisioning in addition to configurations. Again welcome to the forums and don't hesitate to reach out if you need anything.
I am sure I will miss some VMWare/Vcenter stuff but excited to get this working. Snapshots are probably going to be the most missed feature.