cache

  1. Some advice for LVM cache

    I am always continuing my tests and still need some advice. My configuration is as follows: 1 128GB SDD (for Boot) 4 x 1TB HDD (for RAIDZ2) 1 x 500GB HDD (for internal backup) 1 port SATA free for a second 128GB SDD or a second 500GB HDD The memory is 16GB and the users who will use it are 3...
  2. Size on special device for metadata cache

    Hi, I will set up a Proxmox backup server to backup our Proxmox clusters. There are total 9 nodes (6 in one and 3 nodes in one). There are approximately 40 VM and they are using 10TB disk space. I will set up maybe 6 SAS 18TB spinning disks for this and now my question: How big should the...
  3. ZFS RAM usage more than 90% of the system

    Hello, We've upgraded our PVE cluster of ndoes from 5.4 to 6.2 few weeks ago, we also upgraded our ZFS pool to the version 0.8.4. We also added an iSCSI storage (FreeNAS) which hosts now most of the storage. I'm now seeing that the ZFS cache is like eating a little bit too much of RAM (this is...
  4. VM laufen voll im RAM

    Hallo zusammen, ich habe das Problem das meine KVM VMs im RAM voll laufen. Ich allokiere z.B. 4GB RAM und setze 2GB RAM als Ballooning ein. Nach kurzer Zeit sagen wir mal X Stunden ist der RAM bei 3,6GB (laut Proxmox) gefüllt. Auf der Console kann ich gut erkennen das vom wirklichen RAM nur...
  5. ZFS Tests and Optimization - ZIL/SLOG, L2ARC, Special Device

    Since there are many members here that have quite some experience and knowledge with ZFS, not the only that I`m trying to find the best/optimal setup for my ZFS setup; but also want to have some tests and information in 1 place rather than scattered around in different threads, posts and...
  6. [SOLVED] Planungen für meinen Heimserver

    Hallo, ich bin ein Proxmox Neuling und plane derzeit das Aufsetzen meines Heimservers! Bislang hab ich hier einen Server laufen, auf dem Openmediavault läuft. Folgende Dienste soll der Server bereitstellen: - NAS-Funktionalität (SMB und NFS Freigaben) - TvHeadend - Emby-Server - iOBroker für...
  7. Caching mode for Proxmox VE and Ceph.

    With colleagues, we have been using Proxmox VE for a long time. We want to implement Hyper-Converged Infrastructure (HCI). I read about caching modes in the official documentation https://pve.proxmox.com/wiki/Performance_Tweaks I would like to hear an authoritative opinion. What caching mode...
  8. Route cache is full

    Hi, I have added 1000 OVSIntPort to my proxmox node. After rebooting i get the following message: linux route cache is full consider increasing sysctl net.ipv[4|6].route.max_size (image attached) Since then I also have a problems connecting via ssh to my VMs from public IP (dnat set up in...
  9. Proxmox external Ceph Disk Cache remommendation

    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...
  10. ZFS Cache Drive removal

    So what I have is a zfs disk that has two cache drives on it and I would like to remove the smaller one listed below. There are no errors on on them. Can I remove it while it has data cached on it? There are 70+ vm's and containers running on this server so I would rather not have to reboot it...
  11. LVM Cache stuck at Flushing blocks for cache

    Hi, I've setup a new hypervisor setup with LVM Cache using SSD's on a Raid 6 Volume. Whenever I have to move a disk or migrate it, I always change the LVM cachemode from writethrough to writeback to prevent unnecessary write wear to the SSDs. Once the disk move is done, I change it back to...
  12. Newbie questions about ZIL/SLOG and L2ARC

    Hi, i am new to Proxmox VE. I've put 4 x 1TB nearline SAS drives in a Dell Precision T5500 on a PERC H200 and installed the pve on them in RAID10. I feel them a little slow and want to accelerate them with PCIe SSD accelerator SUN F20. The Prox sees 4 x 24GB SSDs and i want to use 2 of them in...
  13. Adding SSD for cache - two ZFS pools

    Hi all, I would like to improve performance in my second pool 3x1TB HDD RAIDz1,I want to lower I/O delay its not high but I was reading also that there shouldn't be any I/O delay, (first pool where is Proxmox I have 2xSSD in RAIDz) by adding SSD drive as cache. I found already on Google some...
  14. Frage zu Cache-Pool

    Hallo Gemeinde, ich möchte gern an eurem Kelch der Proxmox-Ceph-Erfahrung nippen.... Wir betreiben hier einen Proxmox-Cluster mit Ceph und drei Nodes. Alle Platten für Ceph sind 12k SAS-Platten (6 pro Node), Ceph-Netzwerk redundant 10Gbit. Macht es Sinn noch einen kompletten Node...
  15. Changing default cache mode for new hard disks

    I recently learned that using a glusterfs storage backend requires the virtual hard disks to have some cache mode other than "No cache". Is there any way to overwrite the default PVE settings to ensure that every new hard disk is created with cache mode (i.e.) "Write through" instead of...
  16. 2 SSDs as cache - Striped?

    I have 2x 512Gb Samsung 860 PRO drives (MLC) ready to go in to my pool of spinning disks as cache. But I wonder what the best set up would be for this. I want to have both write and read cache but to be able to max out my 10gbe connection they need to be striped. So should i stripe these drives...
  17. Wrong CPU cache stats in all VM's

    Hi there, I've recently been dealing with some strange performance issues in cache-heavy applications. My host doesn't get properly loaded (50 ~ 70% max cpu) unless I perform CPU-only heavy tasks. When looking around I found out that all my VM's report oversized L2 and L3 caches, which is a...
  18. 3.3->5.1 - Neuinstallation mit SSD Upgrade - Partionierung und Filesystem?

    Hallo zusammen, mein Proxmox-Host soll endlich auf die neueste Version hochgezogen bzw. neu installiert werden. Es geht mir hier in meinem Thread darum wie ich die Platten partitionieren und welches Dateisystem ich nutzen soll. Hier zuerst mal die bestehende Hardware auf der bis dato die 3.3...
  19. LVM cache, advised?

    So I just rebuilt my LVM to just my SAS drives but I still ahve two enterprise grade 32Gb SSD's in the server and I saw a guide online saying LVM supports cache like so : Create The fast method is creating a PV (if necessary) on the fast disk and add it to the existing volume group: # vgextend...
  20. Issue with cache/ram on high speed writes on ssd raid

    Hello, We're trying to do high speed writes on a hardware RAID device using SSDs. We tried to direct mount the disks using the physical device pass through (using a guide I can't post here because I'm a new user ) but every time we try to write to the device it fills up the RAM, the swap...

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