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[Bug 1523246] Re: Virtio-blk does not support TRIM


From: Thomas Huth
Subject: [Bug 1523246] Re: Virtio-blk does not support TRIM
Date: Mon, 12 Dec 2022 13:33:33 -0000

I think you should check with "du" but without "--apparent-size" since
that parameter counts the sparse blocks, too. See e.g.:

$ truncate -s 10M test.dat
$ ls -alh test.dat 
-rw-rw-r--. 1 root root 10M Dec 12 14:31 test.dat
$ du -sh --apparent-size test.dat 
10M     test.dat
$ du -sh test.dat 
0       test.dat

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https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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