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I have now found out that it's probably not caused by ZFS. I'm currently investigating this and will update this thread as soon as I know more. It seems to be related to networking.

Hello @wolfgang , I have upgraded the RAM now to 144 GB RAM, however the issue is still present. I even limited the L2ARC to 2x 50 GB for our pools and still it uses all the RAM available within hours. ZFS Stats: 13 1 0x01 95 4560 35972193653 69701583200712 name...

What hardware do you use and how is your storage configured? What speed do you get with dd?

ARC Stats: 13 1 0x01 92 4416 5674521768 291213078098343 name type data hits 4 142724564 misses 4 134614645 demand_data_hits 4 116295284 demand_data_misses 4 108563068...

Hello @wolfgang, thanks for clearing that up - makes sense. However why does ZFS then report a L2ARC size of 10 GB with 100 Mb headers? Is the RAM not freed after I destroyed the cache device and readded it?

Yes correct. I have many Linux and Windows based VMs and they all are running fine now without upgraded VirtIO drivers.

@Andreas Piening I can confirm that after upgrading to PVE 5.1 the issue is gone and the host is operating normally again with SCSI (virtio-scsi).

Hello, we're facing serious issues with Proxmox since upgrading to PVE 5.1. The host uses more than 95% memory usage and then swaps heavily which causes ZFS to crash due to blocked tasks (task x blocked for more than 120 seconds). This happens on a daily basis, although the VMs itself do not use...

Hello, I just installed the Kernel Linux 4.4.83-1-pve, however the IO issue remains. Have set a few VMs that did a lot of IO to IDE and load is much better now (20% -> 4%) and the packet drops are gone.

@AlBundy did you also had the network issues under load like lags and packet loss/high latency before?

@aderumier unfortunately the Proxmox server is currently running in my production cluster and I don't want to reboot the node now.

@Andreas Piening I'm pretty sure the Proxmox Team is aware of the issue but they don't have any clue how to fix this. From my understanding the issue is present if scsi with virtio controller is used. @aderumier I did not upgrade from Proxmox 4. It was a clean Proxmox 5 install (with Proxmox...

Hello, unfortunately it seems like I have the same issue. Recently migrated two Proxmox VE 3 and 4 nodes into one Proxmox VE 5 node and networking is unstable resulting in lags in applications like Teamspeak and SSH. IO delay is between 6-10% with multiple ZFS thin pools with SSD L2ARC and ZIL...

Hello, I use Proxmox 4.4-13 (latest version) with LVM-thin store on a HP RAID with 4 SSDs (RAID 10). I'm currently migrating some VMs from a Proxmox 3.4-16 installation. I backed up a VM (qcow2/local) with Snapshot mode and gzip 2 compression to a NFS data store. When I restore the backup to...

Very nice, would love to see Ceph Jewel and CloudInit coming in Proxmox VE 4.4

Hey, why are you migrating your OpenVZ containers? You know, that Proxmox VE 3 will not receive any updates anymore next year(Q1 2016). Even no security updates.

Hi, Node rules are saved to /etc/pve/nodes/YOURNODE/host.fw Best regards, Henry

Hey, don't think that OpenVZ will die. Especially for hosting I think it's better than LXC because it support CPULIMIT, IOLIMIT, IOPSLIMIT. Currently running a quite stable Proxmox OpenVZ Ploop cluster with integration for Graphite/Grafana, Traffic accounting/calculation, rsync backups, Duo...

Hey, when hosting multiple KVM servers on the same bridge, each KVM can see each other in the network and the ARP requests. Any way to filter these? Thought about using arptables and drop these and only allow the routers MAC address or block it at all(ip link set dev tapXXiY arp off) Don't know...

Thank you ;)