Hi And what if I work with BTRFS inside the VM??? The FS where VM image lay could be any other FS... Currently, I am use GlusterFS + XFS. I need LVM or BRTFS inside the VM, in order to resize disk partition... And I am between LVM or BRTFS....
2016-02-02 15:10 GMT-02:00 Adam Thompson <athom...@athompso.net>: > As far as I know, there is still one big problem with BTRFS for Proxmox: > > Running a thin-provisioned VM (i.e. QCOW2) on top of a BTRFS filesystem on > top of a regular spinning-rust HDD produces **extremely bad** performance. > > Running the identical system but on ext2/ext3/ext4 produces the expected > performance you'd get out of an HDD. > > Running the BTRFS system on an SSD instead of an HDD works fine. > > IIRC, it has something to with the way BTRFS journalling works, such that > whenever the QCOW2 file had to grow, there was an I/O multiplication effect. > > That testing was done in CentOS and Ubuntu, not PVE, but apparently the > problem is related to the way QCOW2 and BTRFS interact so would be > persistent across all environments. > > Possibly either BTRFS or QCOW2 have fixed this by now, I don't know. > > -Adam > > > _______________________________________________ > pve-user mailing list > pve-user@pve.proxmox.com > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user > -- Gilberto Ferreira +55 (47) 9676-7530 Skype: gilberto.nunes36
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