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Hi, the base pool is a replicated pool as well. I created another pool with the same crush rule without cache tiering, resizing is working as expected. Maybe this is happening because i added the cache tier to an existing pool ( i did it with all VM powered on) ?

Hello, i'm currently running a ceph cluster (Hammer), last weekend I implemented a cache tier (writeback mode) of SSDs for better performance. Everything seems fine except for disk resizing. I have a Windows VM with a raw RBD disk, i powered off the VM, resized the disk, verified that both ceph...

Actually I didn't, the memory free now it's very low, less than 1G but i think it's normal because there's the cache. On proxmox UI the actual memory usage is below 50%

I disagree, the problem happen on any of the three hosts, no kernel panic just network isolation.

Hi, i'm using Proxmox 4.2.6-1-pve and i think i have a huge problem. I have 3 nodes configured as cluster, sometimes under heavy load like a VM Cloning i lose one node. Basically the VMs inside it are responding but they're not accepting new connection, for example if i am on a RDP session i can...

Got it! the difference: With KRBD: -drive file=/dev/rbd/rbd-ssd/vm-800-disk-1,if=none,id=drive-virtio0,cache=writeback,format=raw,aio=threads,detect With Librbd: -drive...

Hi Spirit, thanks for your patience,now i get what is the main difference between krbd and librbd and why there's a substantial performance gap. What i keep not understanding is how you "tell" qemu to use krbd instead of librbd :) When i did the test i just powered on the same Windows Machine...

Thanks for the explanation! I see lot of people disabling auth and debug feature to improve performance, i always wonder if this is safe to do on a large production environment. I'm using Xeon E5520, i know it's not brand new cpu but with nmon i haven't see any core on proxmox reaching 100%. So...

Thanks, reading the articles helped to understand a little more, but the articles don't specify which setting is changed for instructing qemu-kvm to use krbd vs librbd

Hi dietmar thanks for the clarification, but what i don't understand is that on a simple debian install when i connect my ceph pool with the client i don't see any KRBD option, i don't understand what Proxmox KRBD option is actually doing? What configuration changes on the OS?

Hi all, i decided to give proxmox 4 with kvm a try. For testing performance with my existing ceph cluster (so a ceph cluster built outside proxmox) i created a 2012R2 VM with KVM and one VIRTIO disk point to my ceph pool, default values. In the beginning my problem was that i couldn't reach...