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vm:proxmox:ceph:performance [2025/10/31 18:17] – niziakvm:proxmox:ceph:performance [2025/11/01 10:36] (current) – niziak
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   * [[https://www.reddit.com/r/ceph/comments/zpk0wo/new_to_ceph_hdd_pool_is_extremely_slow/|New to Ceph, HDD pool is extremely slow]]   * [[https://www.reddit.com/r/ceph/comments/zpk0wo/new_to_ceph_hdd_pool_is_extremely_slow/|New to Ceph, HDD pool is extremely slow]]
   * [[https://forum.proxmox.com/threads/ceph-storage-performance.129408/#post-566971|Ceph Storage Performance]]   * [[https://forum.proxmox.com/threads/ceph-storage-performance.129408/#post-566971|Ceph Storage Performance]]
 +  * [[https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/|Ceph: A Journey to 1 TiB/s]]
 +  * [[https://www.boniface.me/posts/pvc-ceph-tuning-adventures/]]
  
 ===== Performance tips ===== ===== Performance tips =====
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   * adapt PG to number of OSDs to spread traffic evenly   * adapt PG to number of OSDs to spread traffic evenly
   * use ''krbd''   * use ''krbd''
 +  * more OSD = better parallelism
   * enable ''writeback'' on VMs (possible data loss on consumer SSDs)   * enable ''writeback'' on VMs (possible data loss on consumer SSDs)
 +  * MTU 9000 (jumbo frames) [[https://ceph.io/en/news/blog/2015/ceph-loves-jumbo-frames/|Ceph Loves Jumbo Frames]]
 +  * net latency <200us (''ping -s 1000 pve'')
 +  * [[https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/|Ceph: A Journey to 1 TiB/s]]
 +    * Ceph is incredibly sensitive to latency introduced by CPU c-state transitions. Set ''Max perf'' in BIOS to disable C-States or boot Linux with ''GRUB_CMDLINE_LINUX="idle=poll intel_idle.max_cstate=0 intel_pstate=disable processor.max_cstate=1" ''
 +    * Disable IOMMU in kernel
  
 ==== performance on small cluster ==== ==== performance on small cluster ====