Change of sectorsize

donalddk

New Member
Sep 4, 2019
3
0
1
38
Hi

I have an issue with the sectorsize of a CEPH RBD attached to a Windows VM.

I want to replicate from one Windows VM (on VMware) to an other Windows VM (on Proxmox) with the buildin storage-replication in windows. In order for that to work, the sectorsize must be the same on both Windows VMs.

Output from source VM (on VMware)

C:\Windows\system32>fsutil fsinfo refsinfo f:
REFS Volume Serial Number : 0x44c63f34c63f2618
REFS Version : 3.1
Number Sectors : 0x00000018fffa0000
Total Clusters : 0x0000000031fff400
Free Clusters : 0x0000000025fdfd43
Total Reserved : 0x0000000000333b7c
Bytes Per Sector : 512
Bytes Per Physical Sector : 4096
Bytes Per Cluster : 65536
Checksum Type: CHECKSUM_TYPE_NONE


Output from destination VM (on proxmox)

C:\Windows\system32>fsutil fsinfo refsinfo e:
REFS Volume Serial Number : 0xee72277772274425
REFS Version : 3.4
Number Sectors : 0x00000018fff80000
Total Clusters : 0x0000000031fff000
Free Clusters : 0x0000000031c29c37
Total Reserved : 0x0000000000333b77
Bytes Per Sector : 512
Bytes Per Physical Sector : 512
Bytes Per Cluster : 65536
Checksum Type: CHECKSUM_TYPE_NONE

How do i configure the proxmox VM to "Bytes Per Physical Sector" to 4096 instead of 512 ?

I have tried to add this to the config with no luck.

-device virtio-scsi-pci "logical_block_size=4096" physical_block_size=4096

Here is the VM config

agent: 1
bootdisk: scsi0
cores: 3
memory: 32768
name: VM
numa: 0
ostype: win10
scsi0: proxmox-rbd:vm-103-disk-0,size=60G
scsi1: proxmox-rbd:vm-103-disk-1,size=32G
scsi2: proxmox-rbd:vm-103-disk-2,size=54975380062208
scsihw: virtio-scsi-pci
sockets: 2
 

Richard

Proxmox Staff Member
Staff member
Mar 6, 2015
741
26
28
Austria
I have tried to add this to the config with no luck.

-device virtio-scsi-pci "logical_block_size=4096" physical_block_size=4096

Here is the VM config

agent: 1
bootdisk: scsi0
cores: 3
memory: 32768
name: VM
numa: 0
ostype: win10
scsi0: proxmox-rbd:vm-103-disk-0,size=60G
scsi1: proxmox-rbd:vm-103-disk-1,size=32G
scsi2: proxmox-rbd:vm-103-disk-2,size=54975380062208
scsihw: virtio-scsi-pci
sockets: 2

Works if you use virtio block for the respective disk and set global parameters (example assumes that it's the third disk):

Code:
agent: 1
bootdisk: scsi0
cores: 3
memory: 32768
name: VM
numa: 0
ostype: win10
scsi0: proxmox-rbd:vm-103-disk-0,size=60G
scsi1: proxmox-rbd:vm-103-disk-1,size=32G
virtio2: proxmox-rbd:vm-103-disk-2,size=54975380062208
args: -global virtio-blk-device.physical_block_size=4096 -global virtio-blk-device.logical_block_size=4096
scsihw: virtio-scsi-pci
sockets: 2
Since there is not too much experience with such a configuration issues cannot be excluded.
 

donalddk

New Member
Sep 4, 2019
3
0
1
38
Thank you for your reply

when i set

args: -global virtio-blk-device.physical_block_size=4096 -global virtio-blk-device.logical_block_size=4096

i get this in windows

PS C:\Windows\system32> fsutil fsinfo refsinfo e:
REFS Volume Serial Number : 0x48565d03565cf2e4
REFS Version : 3.4
Number Sectors : 0x000000031fff4000
Total Clusters : 0x0000000031fff400
Free Clusters : 0x0000000031edd35d
Total Reserved : 0x0000000000080856
Bytes Per Sector : 4096
Bytes Per Physical Sector : 4096
Bytes Per Cluster : 65536
Checksum Type: CHECKSUM_TYPE_NONE


The other windows VM i am trying to replicate looks like this

PS C:\Windows\system32> fsutil fsinfo refsinfo e:
REFS Volume Serial Number : 0x287a00577a0023e2
REFS Version : 3.1
Number Sectors : 0x00000018fffa0000
Total Clusters : 0x0000000031fff400
Free Clusters : 0x000000001e9856c8
Total Reserved : 0x0000000000333b7c
Bytes Per Sector : 512
Bytes Per Physical Sector : 4096
Bytes Per Cluster : 65536
Checksum Type: CHECKSUM_TYPE_NONE

So "Bytes Per Sector" is still different - is there any way to manipulate that parameter?
 

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