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Backup your data and recreate ZFS

ZFS flush data in sync mode. It will wait until slowest disk finish write and then it will push another batch to write. And of course all metadata / transaction updates.

If RAM is too expenses then don't use ZFS

I did not find my talk in #IRC about ARC problem but I found the same situation mentioned here - https://github.com/openzfs/zfs/discussions/11676 It is good if they fixed it.

ARC min and max should be not equal, max should be min+1, or min = max-1 Otherwise it will not limit

If you want to speed up write you can set up sync=disabled But keep in mind you can lose some data in the power outage as of VM look here - https://kb.blockbridge.com/technote/proxmox-optimizing-windows-server/part-2.html

Server is running for 19 days without random reboot. I changed network card to Intel 10GB and speeded CPU cooler. One reason in my mind was CPU temp spike.

I'm curious, have you tried speed test?

Try to add mpt3sas.max_queue_depth=10000 to your kernel boot line in /etc/default/grub or /etc/kernel/cmdline

You can download deb directly - http://ftp.no.debian.org/debian/pool/main/d/debsums/debsums_3.0.2.1_all.deb Using Live distro you can mount rpool and then bind mount /dev /sys /proc , chroot and use it as normal OS. In that environment you can install debsums, look at files and do changes.

It should make no problem to install but If you are struggling you can download directly - https://packages.debian.org/bookworm/all/debsums/download

Mixing different performance disks will lower your all disk performance to the lowest disk performance.

https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#scrub

I would give a shot with #debsums for some curiosity

If you want to have auto healing using single disk then you have to set copies more than 1

Looking to your storage config your ZFS nvme_cluster pool must have mount point to /nvme_cluster rootfs should be: nvme_cluster:subvol-122-disk-0,size=32G

It is good to play with half way broken HDD to understand how filesystem react to the problems.

If you are connecting to Windows VM you can use this manual - https://www.itechtics.com/use-multiple-monitors-rdc/ I think the same could be achieved with Linux too.

Old thread but I have the same problem. If I set ram as hotplug and size 122880: TASK ERROR: memory size (122880) must be aligned to 4096 for hotplugging If I change to 123904: Kernel panic - not syncing: System is deadlocked on memory If I remove ram from hotplug and set the size 122880...

BTW is it standalone server or cluster ?