[PVE-User] disk replacement procedure when using device passthrough ?

[devzero at web.de]

it's always the same, you are searching for hours and then, just after asking for help, you find something....

ok - i tried "qm unlink" and that seems to remove the disk  - but what's the meaning of "invalid drive key" ?

root at pve1:/etc/pve/qemu-server# qm unlink 100 --idlist 'scsi4'
update VM 100: -delete scsi4
invalid drive key: virtioscsi4



> Gesendet: Dienstag, 12. März 2019 um 19:32 Uhr
> Von: devzero at web.de
> An: pve-user at pve.proxmox.com
> Betreff: [PVE-User] disk replacement procedure when using device passthrough ?
>
> hello,
> 
> what is the correct procedure for disk replacement when using raw-disk passthrough into a VM ?
> 
> if i remove a disk to simulate failure, both host and VM correctly see it fail. fine.
> 
> when i plug it back, disk comes back online with a new disk-name "sdX" and kvm VM does not open
> that by itself - sure, most likely expected behaviour.
> 
> but i don't find a way to tell kvm VM to "hot unplug" or forget about the old, removed disk.
> 
> unfortunately, there is only "qm set <id> -scsiX .....", but no unset or "hot unplug" command for
> disk which had been added.
> 
> i have come a little bit closer to re-add that by adding the disk as a NEW scsi disk "scsi7",
> but how do i tell kvm it should stop using the former device/path ?
> 
> i searched into kvm documentation, but i don't find a proper example on how to do this...
> 
> i want to avoid downtime/maintenance window in case of a disk failure...
> 
> regards
> Roland
> 
> 
> 
> 
> root at pve1:/etc/pve/qemu-server# cat 100.conf
> bootdisk: scsi0
> cores: 8
> ide2: local:iso/CentOS-7-x86_64-DVD-1804.iso,media=cdrom
> memory: 2048
> name: backupvm3
> net0: virtio=DA:C3:4F:AD:92:93,bridge=vmbr0
> numa: 1
> ostype: l26
> scsi0: local-zfs:vm-100-disk-0,size=15G
> scsi1: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX11D4430551,size=5860522584K
> scsi2: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX11D4435339,size=5860522584K
> scsi3: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX51D6416058,size=5860522584K
> scsi4: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX51H3417654,size=5860522584K
> scsi5: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX51H3425161,size=5860522584K
> scsi6: /dev/disk/by-id/ata-WDC_WD60EFRX-68MYMN1_WD-WX51H3425422,size=5860522584K
> scsihw: virtio-scsi-single
> smbios1: uuid=80125eec-ee8f-404c-9b56-3db5f2da2735
> sockets: 1
> vmgenid: eebcc297-2286-4174-9f1d-e7d92e9c01aa
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