Optimize QEMUKVM Virtio storage Driver error

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1

Setup a Windows 1 box with disk drivers as virtio.

<disk type="file" device="disk">
  <driver name="qemu" type="qcow2" cache="writeback" discard="unmap"/>
  <source file="/var/lib/libvirt/images/win11-2.qcow2" index="2"/>
  <backingStore/>
  <target dev="vda" bus="virtio"/>
  <boot order="1"/>
  <alias name="virtio-disk0"/>
  <address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</disk>

I have problems doing a Optimize in Windows:

"Defragmentierung" wird für "(C:)" aufgerufen...


Vor der Optimierung ausgeführter Bericht:

        Volumeinformationen:
                Volumegröße                 = 94.97 GB
                Freier Speicherplatz        = 43.37 GB
                Fragmentierter Speicherplatz insgesamt      = 7%
                Größter freier Speicherplatz     = 16.22 GB

        Hinweis: Dateifragmente, die größer als 64 MB sind, sind nicht in den Fragmentierungsstatistiken enthalten.
        Erneut optimieren:  übersprungen.

Datenfehler (CRC-Prüfung) (0x80070017)

If I connect this (to another win11 vm as second devices with SATA drivers) I can optimize without a problem. Is it possible that the virtio drivers are faulty? Installed what I think are the latest

2

I google translated the message into english and then did a web search for “windows defrag Data Error (CRC Check) (0x80070017)”.
There are a number of promising pages suggesting how to fix this error.

3

Is it possible you’re hitting this?

4

By circumstance I’ve found out that the latest virtio drivers do not support trim or at least not ntfs optimizing.

<disk type="file" device="disk">
  <driver name="qemu" type="qcow2" cache="unsafe" discard="unmap"/>
  <source file="/var/lib/libvirt/images/win11.qcow2" index="4"/>
  <backingStore/>
  <target dev="sda" bus="sata"/>
  <alias name="sata0-0-0"/>
  <address type="drive" controller="0" bus="0" target="0" unit="0"/>
</disk>

Optimize-Volume -DriverLetter C returns:

VERBOSE: Invoking retrim on (C:)...
VERBOSE: Retrim:  0% complete...
VERBOSE: Retrim:  100% complete.
VERBOSE: Performing pass 1:
VERBOSE: Retrim:  87% complete...
VERBOSE: Retrim:  100% complete.
VERBOSE:
Post Defragmentation Report:
VERBOSE:
 Volume Information:
VERBOSE:   Volume size                 = 62.95 GB
VERBOSE:   Cluster size                = 4 KB
VERBOSE:   Used space                  = 28.37 GB
VERBOSE:   Free space                  = 34.58 GB
VERBOSE:
 Retrim:
VERBOSE:   Backed allocations          = 63
VERBOSE:   Allocations trimmed         = 4967
VERBOSE:   Total space trimmed         = 37.42 GB

But with:

<disk type="file" device="disk">
  <driver name="qemu" type="qcow2" cache="unsafe" discard="unmap"/>
  <source file="/var/lib/libvirt/images/win11.qcow2"/>
  <target dev="vda" bus="virtio"/>
  <address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</disk>

(observe: the same image)
The command returns:

VERBOSE: Invoking slab consolidation on (C:)...
VERBOSE: Slab Analysis:  0% complete...
VERBOSE: Slab Analysis:  100% complete.
VERBOSE: Retrim:  0% complete...
VERBOSE:
 Slab consolidation was skipped because there were few evictable slabs.
VERBOSE: Retrim:  100% complete.
Optimize-Volume : The operation failed with return code 40004
Activity ID: {eecd28dd-2d8e-0000-834f-cdee8e2ddd01}
At line:1 char:1
+ Optimize-Volume -DriveLetter C -Verbose
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (StorageWMI:ROOT/Microsoft/...age/MSFT_Volume) [Optimize-Volume], CimExcep
   tion
    + FullyQualifiedErrorId : StorageWMI 40004,Optimize-Volume

I wonder if there is documentation on the drivers? I use this as source

5

My AI of choice says:

  1. Download from: Making sure you're not a bot!
  2. Try version 0.1.240 or 0.1.229 (older versions sometimes work better)
  3. Or try the latest stable version (not the one from 2025)\

How about that…

6

Merging the new thread with the existing thread.
Thanks