Dell PowerVault ME5024 - LUN

[lemen]

Hello,

I am configuring the Dell PowerVault ME5024 disk array, I already have the iSCI configured and I see the LUN from the proxmox. My question is how to configure iSCI to work from virtual machines and recognize the disk or what is the most recommended configuration and what steps to follow.

Thank you

 

[bbgeek17]

The most common way is to place LVM configuration on the LUN.
However, you have to consider other variables:
- Is this intended as shared storage within PVE cluster?
- Do you need snapshot support?
- Do you, perhaps, want to pass through the LUN directly to VM?

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

 

[lemen]

The most common way is to place LVM configuration on the LUN.
However, you have to consider other variables:
- Is this intended as shared storage within PVE cluster?
- Do you need snapshot support?
- Do you, perhaps, want to pass through the LUN directly to VM?

---

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

- Is this intended as shared storage within PVE cluster?
Yes
- Do you need snapshot support?
I would like.
- Do you, perhaps, want to pass through the LUN directly to VM?
I have read that it is not recommended to work directly with LUNa and that is why I am lost

Thanks

 

[bbgeek17]

- Is this intended as shared storage within PVE cluster?
Yes

In that case the only supported configuration is to:
a) Make sure all nodes see the LUN
b) If connected via multiple paths, configure multipath
c) lay LVM (thick) and utilize the resulting Volume Group for PVE disk images

- Do you need snapshot support?
I would like.

Snapshots are not supported in the above LVM (thick) configuration.
Your only option for a "legacy iSCSI storage"+shared+snapshot is to use "Clustered Filesystem"+Qcow. This is not baked into Proxmox and you will need to configure and support it on your own. A good write up can be found here: https://forum.proxmox.com/threads/md3200sas-proxmox-ocfs2-not-supported-by-the-proxmox-team.129156

- Do you, perhaps, want to pass through the LUN directly to VM?
I have read that it is not recommended to work directly with LUNa

Its a legitimate use-case. It has a much higher management overhead with the type of storage system that you operate. It does not provide snapshot support in your infrastructure.

---

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

 

[lemen]

After mounting the iscsi and adding the lvm it gives me this error

 

[bbgeek17]

As the error says - once you configured multipath you cant use underlying device, you need to use /dev/dm-x for LVM

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