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Try this command on omnios while running your benchmarks in the client: zpool iostat -v pool1 3

Simply configure HA groups. See pve-docs/chapter-ha-manager.html#ha_manager_groups

There is no need to use anything else than the r8169(intree) driver provided you have installed this package: firmware-realtek This package contains all binary firmware for any realtek nic which the driver loads on-demand. The intree r8169 driver is co-maintained by realtek which also makes all...

What hardware (cpu, ram, nics, disks) is on the omnios server? And how is the zfs pool configured?

Dell PERC H310 can be flashed to LSI 9211-8i: https://forums.servethehome.com/index.php?threads/bit-the-bullet-on-a-h310.5775/#post-50068

Raid level and number of disks in your Freenas? Disk type in Freenas, HDD, SSD etc?

Debian has tools to create your own local copy of proxmox enterprise repo: https://wiki.debian.org/DebianRepository#Set_up_and_maintain_a_repository

What would be the point of doing so?

Are you sure it is Debian 7? Debian 7 has been EOL for several years!!

What does sudo corosync-quorumtool show on your proxmox nodes?

If you have cash to spend (RSF-1): https://www.youtube.com/watch?v=JZ2PK-AXZ0A Otherwise use UPS to guard your storage server and Cheap: multiple nics using LACP Less cheap: Configure multipath on proxmox to storage server preferable using LACP on each path

From a single SSD: Jobs: 1 (f=1): [m(1)] [97.8% done] [78518KB/26377KB/0KB /s] [19.7K/6594/0 iops] [eta 00m:01s] test: (groupid=0, jobs=1): err= 0: pid=30053: Wed Dec 5 07:43:33 2018 read : io=3070.4MB, bw=68841KB/s, iops=17210, runt= 45670msec write: io=1025.8MB, bw=22998KB/s, iops=5749...

This simply means that LVM is used (dm == DeviceMapper)

A storage solution based on Omnios using ZFS over iSCSI is rock stable and gives very good performance given the ZFS pool is properly configured. A raid10 like setup gives the best iops for the sake of available storage. This in depth article is recommendable...

This /dev/vmtank/disks/vm-129-disk-1 is a local disk so you are not using ZFS over iSCSI. ZFS over iSCSI requires a remote server exposing a ZFS pool for which there is support in the ZFS over iSCSI storage type. You cannot migrate a local disk exposed via iscsi.

What console solution? Generally I find keyboard support considerably better when using spice console, so if you haven't tried spice try it.

This file is mentioned in man.db but is not part of Debian.

I was referring to the proxmox checkbox 'discard' to prevent confusion not whether the filesystem supports discard or not. Many users have 'discard' checked while running fstrim on a regular basis which is foolish.

If you run fstrim there is no need for discard. fstrim does not rely on nor does it use discard. discard is only used in combination with a filesystem delete.

Checking discard option means that every time you mark a block of data as free due to deleting something a corresponding scsi unmap command will be sent to the disk controller (virtio-scsi) which passes this information through to the physical disk where your disk image hosted. If discard option...