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First of all, what version of Ceph are you running? Luminous requires the addition of manager's, etc. Quite different from "jewel".

Everything I am reading about LVM-Thin in this regard is not promising. https://forum.proxmox.com/threads/lvm-thin-problem-remove-vg-lv.32480/

@Pourya Mehdinejad https://www.experts-exchange.com/questions/27851682/How-do-I-convert-image-from-KVM-to-Proxmox.html Just some extra info.

KVM to Proxmox VE (KVM) Just create an new VM on Proxmox VE and add the existing disk image to this new VM, set the boot order and start.

https://www.computerhope.com/unix/ucrontab.htm

The logical volume sits on top of the volume group. You must have a volume group before you have any logical volumes.

Note the size of the Volume Group "Fileserver" and the size of the Logical Volume "Data" in the case above. It allocates all the space.

This is why it is crucial for people to pveversion -v every node.

I would suggest you get another LSI MegaRAID SAS 9271-4i and switch it out to test. The configuration information is kept on the disks. Make sure the firmware is the same.

Your buffered reads are incredibly bad on that device (/dev/dm0) as are your seek times. Do you have another controller handy?

When you get this set up and tested, please let us know the results. Everything about this interesting subject is too old.

https://forum.proxmox.com/threads/proxmox-ve-support-subscriptions-and-why-everybody-should-buy-one.9244/

apt-get update && apt-get dist-upgrade

The cloud servers with any realistic storage capacity cost a bloody fortune. Get a test VM from Azure and you will see what I mean. We use a CloudberryLabs client to backup our data to Amazon S3, but that is cheap by comparison. Not everyone has millions of dollars to spend and Proxmox works...

https://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE The process is basically the same.

What does this command show? blkid

Check this post for guidance. Note that what your created is block storage. https://www.virtualtothecore.com/en/adventures-with-ceph-storage-part-6-mount-ceph-as-a-block-device-on-linux-machines/ For example: rbd create data --size 10000 rbd feature disable data exclusive-lock object-map...

I have used it on 7 and 10 for a long time. No issues at all.

John, make sure you test those backed up guests. Since you may be using a USB external drive for the backup storage, reliability comes into question.

Did you see this? https://unix.stackexchange.com/questions/249654/message-at-shutdown-watchdog-did-not-stop