slow

  1. [SOLVED] cluster ceph very slow when one node is offline

    Hi, We have a cluster of 4 servers (all of them are up-to-date 6.0.7 version) We have configured ceph on both, with 3 monitors. All server work well when thez are all online but when one host is down , the other are very very slow. Have you ever seen this? Regards,
  2. Very Slow Proxmox 5.3 Host with High IO Delay and only one VM

    Hello. I have 3 Proxmox hosts, one with version 4.4, another one with version 5.2 and the latest with Proxmox 5.3. From these 3 hosts, I would expect the 5.3 host to be the most performing taking into account the better hardware. All of the hosts have hardware RAID 10, with the latest (5.3...
  3. 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...
  4. [TUTORIAL] Fix For Slow Startup/Boot on Windows Server VMs

    Hello, Pardon me, as I am sure this is common knowledge for many PVE users. For me, it took many frustrating hours to find the fix, so I will document it here as I have not seen this particular problem/solution laid out explicitly elsewhere. This video from the PVE team documents the fix but...
  5. Benchmark: ZFS vs mdraid + ext4 + qcow2

    After fighting with ZFS memory hunger, poor performance, and random reboots, I just have replaced it with mdraid (raid1), ext4, and simple qcow2 images for the VMs, stored in the ext4 file system. This setup should be the least efficient because of the multiple layers of abstraction (md and...
  6. 30+ min boot time

    We have some server that display some really long boot time. We are talking about 30min to 45min each. At first I though it was related to the server POST but the image here show the server finished his POST correctly and gave control to the OS. This is where they hang for 30+ min. We have...
  7. Long delay from command issue to command execution

    I have a (what appears to be) intermittent problem with container shutdowns taking a LONG time. For example: As you can see, there is a NEARLY 7 MINUTE delay from the stop request end time to the shutdown command. What is the cause of this delay and how can it be mitigated?
  8. LVM over iSCSI slow I/O

    Hello, I have new HPE DL360 with proxmox and Synology NAS RS2418+. I trying migrate my VMs from backup which they are on different (old) NAS to new proxmox installation where I use iSCSI target. 1. I created LUN and Target on NAS. 2. add iSCSI to proxmox 3. add new LVM to proxmox storage...
  9. Window VM "freezes" if written via SMB

    Hello everyone, I have got the following problem: My Home-Server running Proxmox has some strange problems since I installed a 10GBit Network Card. If I write on a network share, it sometimes drops to a tranfer rate of 0 kbyte for several seconds (up to 15-20). The Proxmox-VM uses Virtio...
  10. Netzwerk Probleme

    Hallo Community Ich habe ein kleines Problem mit meinem Proxmox Server. Auf dem Server selbst erhalte ich bei einem Netzwerk-Speed Test folgende Werte: Auf der VM erhalte ich aber folgende Werte: Server Konfiguration: VM Konfiguration: Auf der VM läuft Windows Server 2016. Ich habe die...
  11. [SOLVED] Slow operation when migrating a container

    Hi all. I'm trying to do a project for school with high availability and we choose do it with proxmox, but I have a little problem. I have 3 nodes, and the storage the de VMs and containers is on NFS connected directly with the nodes of proxmox. My problem is, when I try to migrate doing...
  12. ceph performance is really poor

    I have a cluster of 6 nodes, each containing 8x Intel SSDSC2BB016T7R for a total of 48 OSDs. each node has 384GB ram and 40 logical cpus. For some reason, this cluster performance is really low in comparison to other deployments. deploying the gitlab template took well over 5 minutes...
  13. Slow disk speed on Windows VM

    Hi, I installed a fresh Proxmox VE and tested the speed of the disk: root@pve:~# dd if=/dev/zero of=./test bs=1G count=1 1+0 records in 1+0 records out...
  14. Increase performance with sched_autogroup_enabled=0

    Changing sched_autogroup_enabled from 1 to 0 makes a HUGE difference in performance on busy Proxmox hosts Also helps to modify sched_migration_cost_ns I've tested this on Proxmox 4.x and 5.x: echo 5000000 > /proc/sys/kernel/sched_migration_cost_ns echo 0 >...
  15. Ceph and node reboot

    EVERY time we need to restart one of our nodes in our cluster we are faced with this HORRIFIC impact on disk I/O while the Ceph pools need to be "rebuilt". It virtually consumes all of the resources and we need to know how to prevent this. I am simply talking about issuing a 'reboot' after...
  16. ZFS, extremely slow writes, soft lockups

    Hi, I have a server with 4.4-22 installed (updated since I read somewhere that it should help, but it doesn't) and sometimes have extremely slow writes in the guests. For example sometimes it works, and most of the time when a larger file (50MB+ size) is written, the guest goes into soft...
  17. VM runs very slow

    Hello ! I use a self-bought server colocated somewhere in Romania and I feel that there isn't normal what happen. When I install OS (any version of centos/freebsd) it is going very, very slow (over 10 minutes for a minimal iso). Server configuration: HDD: single ADATA SU650 SSD 240 GB...
  18. Fresh install of PVE 5.1, IO delay of death

    I completely wiped out my system and started from nothing after I assumed I made a mistake. I thought because I mixed SSD and SAS drives in LVM it caused my IO issues. This time I completely left the SSD drives untouched and installed proxmox on the large SAS raid 5 array on the hw controller...
  19. Mild Disk IO brings VM to its knees

    I'm running a windows server 2016 VM on proxmox, so far it has no roles defined or anything just core + gui installed. I have one shared folder and I'm busy copying data from our current file shares onto it using Allwaysync software over the network. While this copy process is happening the...
  20. Sometimes very slow Windows 2008 guest startup

    Fresh installed proxmox, 2 HDD for system and 2 HDD for storage : The only guest installed - windows2008r2 with latest VirtIO drivers from virtio-win-0.1.126.iso Normally windows guest starts in 10-20 seconds, but sometime it may go on up to one hour. At this moment atop shows that system...

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