Description of problem:

While converting VMware VMs to RHV, the user is observing low speed. Some of the operations below are taking a huge time which is causing the delay in the conversion.

The generation of new initramfs image took 15+ minutes.

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[ 1449.362481] dracut[1457] Executing: /sbin/dracut --verbose --add-drivers "virtio virtio_ring virtio_blk virtio_scsi virtio_net virtio_pci" /boot/initramfs-3.10.0-1062.18.1.el7.x86_64.img 3.10.0-1062.18.1.el7.x86_64^M
*** Creating initramfs image file '/boot/initramfs-3.10.0-1062.18.1.el7.x86_64.img' done ***^M
[ 2406.482080] dracut[1457] *** Creating initramfs image file '/boot/initramfs-3.10.0-1062.18.1.el7.x86_64.img' done ***^M
commandrvf: stdout=n stderr=n flags=0x0^M
commandrvf: umount /sysroot/sys^M
commandrvf: stdout=n stderr=n flags=0x0^M
commandrvf: umount /sysroot/proc^M
commandrvf: stdout=n stderr=n flags=0x0^M
commandrvf: umount /sysroot/dev/pts^M
commandrvf: stdout=n stderr=n flags=0x0^M
commandrvf: umount /sysroot/dev^M
renaming /sysroot/etc/6k7w5pmk to /sysroot/etc/resolv.conf^M
guestfsd: => command (0x32) took 1046.94 secs^M
===

The "rpm -e open-vm-tools" command took 10+ minutes to complete.

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commandrvf: rpm -e open-vm-tools^M
libguestfs: trace: v2v: command = ""
libguestfs: trace: v2v: aug_load
guestfsd: => command (0x32) took 608.77 secs^M
===

And the selinux relabel took around 5 minutes.

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commandrvf: setfiles -F -e /sysroot/dev -e /sysroot/proc -e /sysroot/selinux -e /sysroot/sys -m -r /sysroot -v /sysroot/etc/selinux/targeted/contexts/files/file_contexts /sysroot/^M
libguestfs: trace: v2v: rm_f "/.autorelabel"
guestfsd: => selinux_relabel (0x1d3) took 273.91 secs^M
====

I can see the below error randomly getting logged between above jobs.

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nbdkit: curl[2]: error: pread: curl_easy_perform: HTTP response code said error: The requested URL returned error: 401
nbdkit: curl[2]: debug: pread failed: original errno = 5
nbdkit: curl[2]: debug: retry 1: waiting 2 seconds before retrying
nbdkit: curl[2]: debug: curl: reopen readonly=1 exportname="/"
nbdkit: curl[2]: debug: curl: finalize
nbdkit: curl[2]: debug: curl: close
===

To test, the customer exported the same VM as OVA, copied it to the hypervisor, and then did the convert and the conversion speed was as expected and the issue is only while directly importing from VMware.

The customer also check for possible errors in VMware and was not able to find any.

Version-Release number of selected component (if applicable):

nbdkit-1.22.0-2.module
libguestfs-1.42.0-2.module+el8.3.0+6798+ad6e66be.x86_64
virt-v2v-1.42.0-6.module+el8.3.0+7898+13f907d5.x86_64


How reproducible:

100% for the customer.


Steps to Reproduce:

1. Convert a VMware VM to RHV.
2.
3.

Actual results:

Slow conversion speed while converting VMware VMs to RHV

Expected results:


Additional info: