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I only run LTS releases so I haven't tried any later versions than 151022. You could try asking for help here: https://illumos.topicbox.com/groups/omnios-discuss I think you are facing a network/comstar related problem.

What version of omnios do you use?

If you run this command on omnios: stmfadm list-lu -v Does all your Luns show this? Writeback Cache : Enabled

Your storage box seems to be working perfectly. The only thing I can think of is network related since iSCSI performance is very picky when it comes to network configuration and especially MTU. What MTU are you using on the network handling iSCSI traffic? I personally use infiniband so on my...

Could you show output from zpool get all pool1 zfs get all pool1 on omnios

Your Intel Optane 900p should not be where your worries are: https://www.servethehome.com/exploring-best-zfs-zil-slog-ssd-intel-optane-nand/

Try using fio for disk benchmark using this (copy below as input to a file to use as input to fio) # This job file tries to mimic the Intel IOMeter File Server Access Pattern [global] description=Emulation of Intel IOmeter File Server Access Pattern [iometer]...

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)