cache=writeback

Situation: - ZFS on NVME, 1GB/s nvme read speed - ARC (in ram) size about 120GB - fully heated pve-manager/8.1.4 (running kernel: 6.5.13-1-pve) CPU: E5-2683 v4 This CPU has a very poor per-core performance. This leads to: - Windows 10 VM, Virtio-SCSI Single, iothread, 128kb block, cache=none ->...

Dear Community, I want to set up a new PVE environment and I´m not sure about the correct caching configuration. I´m using the Adaptec ASR-71605 hardware RAID controller (RAID 1 and 2x SSD) with an integrated BBU and 1 GB of Cache. What is the best configuration in my case? If I understand...

Hi We are in the process of migrating services from servers running a local ZFS-mirror on 4TB nVME SSD drives. We are migrating to new servers with the same specifications and hardware as what is currently running, but instead of spreading services over two nodes (a 3rd node runs some internal...

While benchmarking a Win10 VM in PVE 6.3-4 with CrystalDiskMark I got kernel panics (Out of Memory). This happend every time I tried the benchmark. Looking at htop it was surely a RAM memory related issue. I first thought it was an over-assigning problem with my memory to VM's or a ballooning...

Hello, I searched this forum and google but i cannot find the final aswer.. We have a Proxmox cluster with a remote Ceph Luminous cluster. I see i get muge faster writes with Cache=writeback in the disk options in Proxmox, (random 4k up to 16x faster and Seq 10x faster) then with cache=none...