[PVE-User] LVM usage

[Dmitry Petuhov]

No, that's not bug, that's feature. If fstrim frees space, then you have 
discard enabled on host (in VM config).

You need to enable discard for guest filesystems on mount (usually in 
/etc/fstab), or just put fstrim to crontab.


26.01.2019 23:56, Daniel wrote:
> But when this is not enbaled by default in Proxmox it sounds like a "bug" inside Proxmox?
> Problem is that I have in general no access to mount options inside Proxmox.
>
> Fstrim is working for me at the moment. But this cant be a working solution.
>
> Am 26.01.19, 21:25 schrieb "pve-user im Auftrag von Dmitry Petuhov" <pve-user-bounces at pve.proxmox.com im Auftrag von mityapetuhov at gmail.com>:
>
>      This means that this 94.22% was once used. LVM knows when guest uses
>      block first time, and allocates it at this omoment, but does not knows
>      when it is freed in guest. You need to enable discard both in disk
>      config on host and on filesystem in guest (via mount option of FS, or
>      regulary run fstrim or its analog in your guest OS) to free space on
>      host's LVM level.
>      
>      26.01.2019 23:17, Daniel пишет:
>      > Hi there,
>      >
>      >
>      >
>      > i have a question. Proxmox is telling me that my THIN-LVM getting more and more full.
>      >
>      > I checked some virtual machines and I saw something weird (also on different hosts)
>      >
>      >
>      >
>      >    --- Logical volume ---
>      >
>      >    LV Path                /dev/pve/vm-196-disk-1
>      >
>      >    LV Name                vm-196-disk-1
>      >
>      >    VG Name                pve
>      >
>      >    LV UUID                IOLFz3-QmhU-VqFr-nJlo-Ulrr-bsYX-PzJpgW
>      >
>      >    LV Write Access        read/write
>      >
>      >    LV Creation host, time host09, 2017-11-18 14:18:47 +0100
>      >
>      >    LV Pool name           data
>      >
>      >    LV Status              available
>      >
>      >    # open                 1
>      >
>      >    LV Size                500.00 GiB
>      >
>      >    Mapped size            94.22%
>      >
>      >    Current LE             128000
>      >
>      >    Segments               1
>      >
>      >    Allocation             inherit
>      >
>      >    Read ahead sectors     auto
>      >
>      >    - currently set to     256
>      >
>      >    Block device           253:7
>      >
>      >
>      >
>      > As I understand the LVM is using 94,22% of the available Storage (500GB). When I check in the VPS it self it show me
>      >
>      >
>      >
>      > Filesystem                        Size  Used Avail Use% Mounted on
>      >
>      > /dev/mapper/pve-vm--196--disk--1  492G   32G  435G   7% /
>      >
>      >
>      >
>      > So only 32GB is used. What is happened there? There are no  Snapshots or something like this.
>      >
>      >
>      >
>      > Cheers
>      >
>      >
>      >
>      > Daniel
>      >
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