Fstrim proxmox. the Arch wiki has a concise explanation, or Red Hat.
Fstrim proxmox In order to shrink the *. 4 proxmox, was moving a VM from one cluster to another using the "qm remote-migrate" command. The problem with async trim in general is that you can't predict how it's going to behave so a workload may end up deleting something large and tie up significant resources May 24, 2012 · hello using ceph and local zfs , with kvm's with discard set in pve, fstrim does not work. 10. 7TB used) I'd suggest reading up on what fstrim actually is and does, e. 0. Featuring over 400+ scripts to help you manage your Proxmox Virtual Environment. I had to reduce lvm size to 1TB because I use 2TB disk for migrating (physical server is only 1TB) root@pve1:/dev/disk# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert data Apr 2, 2021 · When i ran fstrim it reported less bytes than expected (the difference between non-compressed backup size and used space). qcow2 files you've two Feb 8, 2024 · When doing a live VM migration (latest proxmox enterprise 7) from one server to another where both servers use local disks with lvm-thin (ext4 hardware SSD RAID-10), if the VM hard disk has "Discard" enabled, we find that the migration hammers the I/O of the target node until the first copy Jan 9, 2020 · Latest 7. VMs automate fstrim, while LXC containers need manual or automated fstrim processes for optimal performance. ) on Proxmox 6. Feb 16, 2024 · Proxmox VE LXC Filesystem Trim With traditional hard disk drives (HDDs or spinner disks), there isn't a significant performance penalty for leaving empty blocks or unused space on the disk. By making use of tools like fstrim or virt-sparsify, you can keep your VMs running efficiently while avoiding the pitfalls of over-provisioning. This releases The official website for the Proxmox VE Helper-Scripts (Community) repository. LVM thin pools instead allocates blocks when they are written. bash -c "$(wget . Fstrim in cron or systemd (there should be an fstrim. This could be handy if you have stuff continuously writing to the drives which then later gets deleted, which would cause it to create a large amount of unused data. This is Over time a guest's *. Aug 24, 2020 · Do I need to schedule fstrim for SSD disks (or even HDD?. 3 running a 3 node cluster storing VM's on a 3 disk ZFS pool - all of which is rendered useless if my backups aren't restorable. qcow2 disk files can grow larger than the actual data stored within them, this happens because the Guest OS normally only marks a deleted File as zero, it doesn't gets actually deleted (performance reasons), so the underlying qcow2 file cannot differentiate between allocated and used and allocated but not used storage. Thin-provisioned storage systems also require management to prevent unnecessary storage use. tunnel: -> sending command "nbdstop" to remote tunnel: sending command Mar 2, 2024 · This maintains SSD performance by managing unused blocks. . 2 ? And if I do, how exactly do I schedule such a job? I've searched online but Jul 5, 2020 · Is there a preferred or recommended way to run fstrim on both LXC and KVM guests? Should fstrim be run from the host or inside guests? How often? Daily? Just before a vzdump? Do guests need to be shutdown when shrinking virtual disks? Browsing the forum and admin guide left me uncertain. Trim/Discard It is good practice to run fstrim (discard) regularly on VMs and containers. Find a time when the machine is routinely lightly loaded and run the job then. This behaviour is called thin-provisioning, because volumes can be much larger than physically available space. What Apr 23, 2017 · You put the check on discard in every guest VM disk, AND set fstrim on Proxmox VE host system? In case of Windows VMs, they should be able to manage trim operations by themselves, is it also required the discard check on disks, right? May 29, 2016 · I have Windows VM machine virtualized from physical machine via virtio. Sep 18, 2024 · This is a tutorial on how to make fstrim run more often or on days that you wish. 4 days ago · Excerpts from the Proxmox VE Administration Guide] LVM normally allocates blocks when you create a volume. Nov 5, 2025 · [TUTORIAL] How to Make Fstrim Run More Often in LXC Containers and Linux VMs + the Host (for GRUB and Systemd Proxmox VE Installations) This is a tutorial on how to make fstrim run more often or on days that you wish. Why am I not getting credit for that when I move my VM onto my ZFS? Jan 15, 2024 · After the fstrim, the disk usage in the GUI for that volume isn't changed (still showing 2. More Info Run the command below in the Proxmox VE Shell. First VM moved fine, second one got hung up: 2023-11-09 09:29:28 stopping NBD storage migration server on target. timer systemd unit on most modern linuxes) is best practices for consistent performance. This helps maintain consistent performance on SSDs over time and prevents degradation due to inefficient write operations. When I ran fstrim verbosely in the guest Debian OS after adding discard to fstab it said that it trimmed 51GB. This is designed to work with SSDs on ext4 filesystems only. I get: # fstrim / fstrim: /: the discard operation is not supported /etc/fstab has: UUID=string / ext4 rw,relatime,nobarrier,data=ordered,errors=remount-ro 0 1 kvm config: virtio0 May 27, 2023 · I'm on Proxmox 8. Maybe previous fstrim commands when discard was disabled trimmed the guest filesystem. I tackled this exact issue recently. Within Proxmox, make sure your guests:- are using the VirtIO SCSI disk controller (as you state) have the Discard option enabled on their disk (s) Now, assuming your guests are Linux, you can manually initiate a trim from within the guest, using: sudo fstrim -av If you were to backup your guest now, you should see the backup size is much more reasonable Oct 2, 2025 · Proactive Maintenance Managing thin-provisioned disks in Proxmox isn’t just about saving storage—it’s about ensuring reliability and preventing unexpected downtime. g. For example, I have a Minecraft server running Dec 13, 2024 · fstrim is a command used with SSDs to inform the drive which blocks of data are no longer considered in use by the filesystem so that the drive can internally erase them and prepare them for new data. 8. the Arch wiki has a concise explanation, or Red Hat. 2. bnxih hnixhp nzwca qwn bbhet vaibcal zulraue afrma gnzv jcjz ddf plgno kcy uen jxgcxgq