400 Parameter verification failed hotplug problem - error on hot-unplugging device

RolandK

Renowned Member
Mar 5, 2019
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hello,

on pve host with 8.2.4 and VM with passtrough disks, i'm getting:
# qm unlink 104 --idlist 'scsi25'
update VM 104: -delete scsi25
400 Parameter verification failed.
scsi25: hotplug problem - error on hot-unplugging device 'virtioscsi25'

on second try on the same device, it works
# qm unlink 104 --idlist 'scsi25'
update VM 104: -delete scsi25

disk is:
scsi25: /dev/disk/by-id/scsi-35000c500836b287b,aio=threads,backup=0,detect_zeroes=0,iothread=1,size=3907018584K


same behaviour when using "detach" button in webui.

on first try , i see the disk is being removed in VM, but it is still visible in configuration with some striketrough line, i.e. it looks like vm needs reboot for removal to succeed.

i'm sure, this worked in previous proxmox releases, because this is not the first time that i'm detaching passtrough disk for disk replacement procedure.

can somebody confirm ?

looks like a regression to me
 
>on first try , i see the disk is being removed in VM

i mean inside guest OS, i.e. the detach basically works but is not completed on the host level
 

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