Softaculous

Topic : KVM Poor Disk 4K Performance with Windows.

Posted By: xeonnet on December 9, 2022, 1:15 am

I'm using Windows Server 2019 with KVM.
using LVM SSD Storage.

1q/1t 4K Performance is 4MB/s ~ 5MB/s
32/q1t 4K Performance is 10MB/s ~ 11MB/s

How can i fix this issue?

tested with Virtio, SCSI, No Cache, Default I/O Policy

Posted By: moriahroot on January 5, 2023, 1:54 am | Post: 1

same for me, I get error

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Posted By: kefirchikus on April 27, 2023, 3:44 pm | Post: 2

same problem

Posted By: kefirchikus on April 27, 2023, 6:49 pm | Post: 3

Same problem.

KVM node with LVM NVMe in PCIex4 2TB Samsung RED without RAID and tested on all settings in panel.

Please. help

Posted By: kefirchikus on April 27, 2023, 6:50 pm | Post: 4

Same problem.

KVM node with LVM NVMe in PCIex4 2TB Samsung RED without RAID and tested on all settings in panel.
https://ibb.co/319WRvk

Please. help

Posted By: shaifulhafizal on June 29, 2023, 6:23 pm | Post: 5

test on windows 2019 vm, setup vioscsi\2k19\amd64running node kvm lvm enterprise ssdstorage setting LVM & RAW
setting Disk Caching writeback I/O Policy threads
AS SSD Benchmark 2.0.7316.34247
------------------------------
Name: Red Hat VirtIO SCSI Disk Device
Firmware: 0001
Controller: viostor
Offset: 563200 K - OK
Size: 50.00 GB
Date: 6/29/2023 6:22:52 PM
------------------------------
Sequential:
------------------------------
Read: 4894.15 MB/s
Write: 2957.15 MB/s
------------------------------
4K:
------------------------------
Read: 96.04 MB/s
Write: 25.09 MB/s
------------------------------
4K-64Threads:
------------------------------
Read: 188.44 MB/s
Write: 64.26 MB/s
------------------------------
Score:
------------------------------
Read: 774
Write: 385
Total: 1497
------------------------------

Posted By: jevingala on June 30, 2023, 10:51 am | Post: 6

Hi,

The VPS Disk is made of 512 bytes sector size hence 4k performance would be lower.
This would be supported soon to improve the 4k performance.

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Regards,
Virtualizor Team.
http://virtualizor.com/

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