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Qcow vs. RAW on ZFS best performance?

Koenig
in VM Engine (KVM)

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Hi!

 

I'm planning on setting up "Daily-driver" Windows 11 VM and I'm wondering a bit about disk-performance, what would be best?

 

I have a pool with 4 2TB Samsung 980 NVME SSD's in a raidz1 setup (also used for appdata), wich I'm planning to use for the VM-disk, with a disk-size of 512-768GB, what would be the the best option performance-wise?

1. qcow on ZFS on a dataset without compression LZ4?

2. qcow on ZFS on a dataset with compression LZ4?

3. RAW on a separate dataset without compression?

4. RAW on a separate dataset with compression?

 

Or are there better options?

 

I'm villing to trade som of the performance for beeing able to use a "sparse" image, or is this idea a bad one?

 

/Koenig

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