Virtualized TrueNAS Core crashes during Proxmox Backup

TrueNAS General
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1

Hello,
I’m using Virtualized TrueNAS Core in Proxmox. I have a problem when I backup specific 2 VMs in Proxmox to TrueNAS pool attached via NFS. When VZDump backup is made in around 30% or less on those VMs TrueNAS crashes, which causes high Proxmox’s load avarage (up to 50) and in result Proxmox also crashes. I don’t have access to TrueNAS even via noVNC.

I use TrueNAS for about a year and I’ve never experienced something like this. When I do backup of LXC Containers or upload something via SMB there is no problem.

TrueNAS has 16GB of ram, two mirrored 4TB disks with 1TB free space left. I don’t use TrueNAS jails or plugins, only NFS, SMB and storage related stuff.

One time TrueNAS sent me an email with alerts: “Device /dev/da1p2 is causing slow I/O on pool data”, “Device /dev/da2p2 is causing slow I/O on pool data.” and “Device /dev/da0p2 is causing slow I/O on pool boot-pool.”. I’ve made long SMART test, which didn’t detect errors.

Please help me how to get more logs what exactly is causing it and how to repair it.

2

Are you using virtual disk drives or are you passing through an entire HBA to TrueNAS. You must do the latter.

3

I pass through disks like here pve.proxmox(.)com/wiki/Passthrough_Physical_Disk_to_Virtual_Machine_(VM), so you think that investing in a disk controller card would help?

4

The setup you run is explicitly discouraged and will lead to data loss with a high probability. This has been discussed on this forum again and again.

This is the only known to work configuration for a production system:

5

Thank you so much for your help. Do you think this controller is enough or I should look for something better? aliexpress(.)com/item/1005006533280553.html

6

If you can trust it’s genuine and not counterfeit - I would not buy from Aliexpress but look for a reseller with a good reputation on eBay.

7

I bought one from eBay, it should arrive in a month. I’ll post an update if it helps.

8

I’m running setup with HBA for over a week and I confirm that it resolved my problem. No issues since installing controller card.

Thank you @pmh :grinning:.