NVMe/SSD Cheat Sheet
NVMe and SSD comes in different forms. SLC, MLC, TLC, and QLC References https://www.xda-developers.com/ssd-wear-might-be-the-most-overhyped-hardware-problem/ https://www.xda-developers.com/specs-to-care-about-when-buying-ssd/
Disk Management
Proxmox error “Cannot remove image, a guest with VMID ‘XXX’ exists! You can delete the image from the guest’s hardware pane”
At times, after many live migrations between different disk, and whilst using TrueNAS Scale, you’ll encounter the following error: Cannot remove image, a guest with
How to reduce the size of an LVM disk on a Debian system on Proxmox and an underlying EXT4 disk
Background I’ve never reduced the size of a disk. Everywhere you read up about it there are huge disclaimers that it can break your system,
Oversubscribing LVM-Thin on Proxmox – warnings
Background LVM-Thin is great because you don’t use all the disk space and can share between hosts. However, it’s dangerous to oversubscribe if one of
Proxmox – Unable to wipe disk – disk/partition ‘/dev/sdX’ has a holder (500) – on mirrored disks
Background When deleting a disk from the Proxmox UI, you are presented with several options. Depending on where you started, you might get this problem:
In Proxmox, what is the difference between Virtio SCSI and Virtio SCSI Single?
This is easy to google, but important to note the maximum performant is Virtio SCSI Single and io_thread. See here: https://forum.proxmox.com/threads/default-setting-of-scsi-controller-is-now-virtio-scsi-single.121491/ https://kb.blockbridge.com/technote/proxmox-aio-vs-iouring/ and especially here:
Interesting Smart Messages
List of Useful Commands smartctl -i /dev/sda smartctl -H /dev/sda smartctl –all /dev/sda smartctl –all /dev/sda | grep -i power_on Proxmox Observation I recently observed
TrueNAS Scale on Proxmox VM and iSCSI with directly connected driver error
I’ve seen the below recently in our logs. The errors doesn’t stop anything from happening but it’s still concerning: Apr 28 02:00:19 hv11 QEMU[3161]: kvm:
How to replace a broken mirror on a Supermicro X8DTT
Dilemma. One of the mirrors on your Supermicro has gone. No SNMP management to pick this up? See another article on this website. It’s evident
Dealing with Disk I/O Error with TrueNAS Scale with Passthrough and Proxmox
NAS refuses to start up. Icon has exclamation and triangle. Hover shows I/O error. Examine /var/log/syslog, search “Error IO”. Apr 3 16:21:14 hvX kernel: [4948799.898572]