NTFS passthrough vm ubuntu - slow speeds

[ad3k.pl]

Hello, hope everyone is having a good day!


Running Proxmox 6.3-3
As of now successfully passthrough 2 of my ntfs formatted physical drives to ubuntu vm using scsi virtio. From there in ubuntu vm got smb network share working. My clients are only getting 40-50MB write/read speeds.
I've read about writeback cache but havent try because I would rather ask before I put my data on the line Would it be safe to change it?

Noticed this is not a problem on different vm having lvm disk and ntfs partiton, as of now im unable to reformat 2 ntfs drives due to lack of space.

I've been banging my had against the wall for over a week trying to figure this out.. But I am a newbie


Best regards
Adrian

 

[Stefan_R]

As of now successfully passthrough 2 of my ntfs formatted physical drives to ubuntu vm using scsi virtio. From there in ubuntu vm got smb network share working. My clients are only getting 40-50MB write/read speeds.

Why use NTFS? It is not very well supported in Linux, and will not have good performance in general (as I believe you are currently discovering). Use something Linux native like ext4 or xfs instead. SMB sharing will still work fine.

I've read about writeback cache but havent try because I would rather ask before I put my data on the line Would it be safe to change it?

You can, though of course all cache modes come with different tradeoffs. You can read more here: https://documentation.suse.com/sles/11-SP4/html/SLES-all/cha-qemu-cachemodes.html