Import from ESXi Extremely Slow

[Johannes S]

AFIK the Performance issues comes from an limitation of the VMware API and thus very unlikely to improve.
Maybe one of the alternative Methode work better for you like restore from Backup or the NFS Trick for minimal downtime?
https://pve.proxmox.com/wiki/Migrate_to_Proxmox_VE#Attach_Disk_&_Move_Disk_(minimal_downtime)

 

[barberos]

PROXMOX 9.1.9: Slow import issue from ESXi to Proxmox!
Is this problem being solved at all?
The machine took over 2 days to import (80 gigabytes)

It is not fast but it is also not that slow, what network speeds are you running?
We completed 80GB under 2 hours on a 10gbit backbone.
The network graph you send shows that the speed seems to be dropping by something or being traffic shaped.
Are you transfering over firewall's ?

 

[fireeli]

AFIK the Performance issues comes from an limitation of the VMware API and thus very unlikely to improve.
Maybe one of the alternative Methode work better for you like restore from Backup or the NFS Trick for minimal downtime?
https://pve.proxmox.com/wiki/Migrate_to_Proxmox_VE#Attach_Disk_&_Move_Disk_(minimal_downtime)

Thanks for the tip!

 

[fireeli]

It is not fast but it is also not that slow, what network speeds are you running?
We completed 80GB under 2 hours on a 10gbit backbone.
The network graph you send shows that the speed seems to be dropping by something or being traffic shaped.
Are you transfering over firewall's ?

I'm facing a bizarre issue with virtual machine migration speeds using the same hypervisor (though the problem persists across different hypervisors as well).

• Environment: Direct 10 GbE connection, no firewalls, no network throttling.
• Linux VM (130 GB): Transfers in about 30 minutes (~72 MB/s, which is perfectly acceptable).
• Windows VM (Same size): Takes 2 or more days to complete.

Why is there such a massive performance gap under identical network conditions and data volumes?

I suspect it might be related to how the hypervisor handles filesystem differences (NTFS vs. ext4/XFS) or how Windows processes small files/blocks during transfer. However, a jump from 30 minutes to 48+ hours seems extreme.

 

[fireeli]

Hi everyone,

Update: Got it all figured out! The issue was caused by active snapshots on the Windows VM.

I deleted the snapshots and ran a disk consolidation. Everything works perfectly now, and the migration finishes without any delays. It turns out the snapshots were heavily interfering with the migration process on the hypervisor level.

Thanks everyone for the help. Topic closed!