performance

  1. Very bad iSCSI performance despite no config change

    Hello! I have a small cluster with my VMs living on LVM over iSCSI on a hp msa2050 SAN. I built it back in January and it was nice and quick - didn't even bother with multipath or any tuning because even with 10+ VMs running, it was fast enough. I left it running, doing nothing, until this...
  2. Very slow SERVER and VMs

    Hello dear community. Server features: https://prnt.sc/s3hnb0 (+ a single 2TB HDD hard drive) Configuration of a default VM: https://prnt.sc/s3hq8c Black screen: https://i.imgur.com/MJUMOrD.png I have started having serious problems on my server since I start having quite a few VMs. I have...
  3. Very poor write speeds with Samsung 750 EVO SSD

    Hi, while working in a VM and installing some stuff, I noticed that disk writes are slower than they used to be in the past when running an OS bare-metal on the same hardware without having Proxmox in between. After taking a deeper look with zpool iostat 2 I saw that the write throughput never...
  4. File system in VM

    I am trying to decide between using XFS or EXT4 inside KVM VMs. My goal is not to over-optimise in an early stage, but I want to make an informed file system decision and stick with that. Situation: Ceph as backend storage SSD storage Writeback cache on VM disk No LVM inside VM CloudLinux 7...
  5. CPU Performance

    Hi, which processor type should I choose for the Ryzen 9 3900X processor in VM Create page? Performance compared to the processor is very low.
  6. Performance issue with Ceph under Proxmox 6

    Hi community, we have a server cluster consisting of 3 nodes with EPYC 7402P 24-Core CPUs and 6 Intel Enterprise SSDs (4620) and 256GB RAM each. Also we have a 10Gbits NIC for Ceph. SSD performance alone is fine, Jumbo frames are enabled and also iperf gives resonable results in terms of...
  7. mir

    openvswitch vs linux bridge performance

    Anybody here aware of performance comparison tests made lately between openvswitch and linux bridge?
  8. Does Proxmox need fast storage?

    Hi, I have a simple question which I would like to share with because I’m interested in you point of view. On a Proxmox server I have fast storage (SSDs or NVMe) and slow storage (SAS or SATA). My fast choice could be to install Proxmox on fast storage and use it also for storing virtual...
  9. Gaia

    [SOLVED] PVESTATD High CPU Usage During MDADM Sync

    syncing a newly create mdadm raid 1 (WD Red disks, 1.6T partition size, default sync speed limits, internal bitmap enabled) gets CPU load in the 2 to 2.5 range. machine gets sluggish (despite the Xeon E-2136, 6 cores, 12 threads and 32GB RAM) stopping pvestatd lowers the load to ~1. There is...
  10. Improve VM guest disk performance (Ceph, 10 GBE, Qemu, Virtio)

    Hello @all, we are running a Proxmox cluster with five nodes. Three of them are used for ceph, providing 2 pools, one with hdd, the other one with ssd. The two other nodes are used for virtualization with qemu. We have redundant 10 GBE storage networks and we have redundant 10 GBE ceph networks...
  11. Any performance difference: Node Local storage vs Shared storage

    I am new here so please forgive any forum faux pas and let me know so I don't keep doing it :-) Also, I am originally from a Windows Hyper-V background so please feel free to correct terminology mistakes. I am setting Proxmox up on a single physical server with 3 raid arrays (it has a HW RAID...
  12. Performance issues with OpenMediaVault VM (ZFS/LUKS...)

    Hi For a home server/nas I'm using the latests versions of Proxmox (5.4) and OMV (4.1.22-1) on recent hardware (core i3-8100, 16gb of ram, installed on a ssd...). I have only one 8TB hard-drive with no raid configuration for my data storage. I use my previous server (intel Atom J1900, 8GB of...
  13. Offline Migration extremely slow

    Hey, I noticed a huge issue. When I try to migrate a VM to a different node I get extremely slow transfer rates. This is unexpected since I use a dedicated Gigabit network for migration (which is unused except for migrations). Unsecure flag is set aswell. Have a look on this migration log...
  14. HW Raid performance query: LSI 3008

    Hi, I wonder if anyone has experience and can comment maybe. I've just spent some time reviewing a pair of lenovo servers, which have this HW Raid controller. 2 x identical nodes in a small proxmox cluster, proxmox 5.Latest. There is no problem with the controller being recognized and...
  15. How to use Virtio-blk-data-plane in Proxmox instead Virtio-SCSI?

    Currently with VirtIO-SCSI (VirtIO-SCSI Single with threads) have max IOPS is ~1.8k-2.3k. But Virtio-blk-data-plane may have over 100k IOPS https://www.suse.com/media/white-paper/kvm_virtualized_io_performance.pdf May I switch to Virtio-blk-data-plane instead VirtIO-SCSI in Proxmox?
  16. CEPHFS rasize

    Hi , Is there anyway to change read ahead of the cephfs. According : docs.ceph.com/docs/master/man/8/mount.ceph/ and : lists.ceph.com/pipermail/ceph-users-ceph.com/2016-November/014553.html (could not place hyper link - new user) this is should be improve reading single large files. right now...
  17. Base template on SSD drive - how good is the performance improvement?

    Actually the subject says it all... I have a server with ZFS where I have 2xSSDs in mirror where proxmox installation, L2ARC and ZIL reside. Then a bunch of 10k HDDs in a pool where the VMs are running. On a different forum thread I have read that a) using linked clones does not affect...
  18. [SOLVED] Low disk performance in windows vm on optane

    Hi, I've been doing some pre-production testing on my home server and ran into some kind of bottleneck with my storage performance, most notably on my optane drive. When I install a Windows vm with the latest VirtIO drivers the performance is kinda dissapointing. I've tried switching over from...
  19. Performance Problem Proxmox 5.2 with RAIDZ-1 10TB

    Hello I've been looking for the reason for the slowness of my Proxmox server but I have not been able to detect the problem. I have an HP DL160 server with 2 Intel Xeon processors, 32GB RAM DDR4 and 4 4TB hard drives in RAIDZ-1 ZFS (10TB Storagen in local-zfs) I have installed 3 VMs: 1 Ubuntu...
  20. Optimization for fast dump/backup

    Hi all, I've got a couple of Proxmox servers (single no HA) with SATA drives and getting a backup is a real pain. It takes 50 minutes or so to get a 60-70GB of backup. I'm planning to migrate a few of these servers into one new much more powerful server with the following drives/setup: 4 x...

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