How to mount a host partition within a VM as swap?

[David Fell]

My proxmox host has an SSD that I want to use as swap space for one of my VMs. I don't understand how to connect it though. If I try to add another disc as hardware in the VM hardware tab, it only lists my ZFS stuff - but the partition I want to use is just a raw partion (/dev/nvme0n1p6). Towards the end of this list (p5 is swap for the host):

root@zen:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 3.7T 0 disk
├─sda1 8:1 0 1007K 0 part
├─sda2 8:2 0 3.7T 0 part
└─sda9 8:9 0 8M 0 part
sdb 8:16 0 3.7T 0 disk
├─sdb1 8:17 0 1007K 0 part
├─sdb2 8:18 0 3.7T 0 part
└─sdb9 8:25 0 8M 0 part
zd0 230:0 0 8G 0 disk
zd16 230:16 0 32G 0 disk
├─zd16p1 230:17 0 28G 0 part
├─zd16p2 230:18 0 1K 0 part
└─zd16p5 230:21 0 4G 0 part
zd32 230:32 0 32G 0 disk
├─zd32p1 230:33 0 28G 0 part
├─zd32p2 230:34 0 1K 0 part
└─zd32p5 230:37 0 4G 0 part
zd48 230:48 0 32G 0 disk
├─zd48p1 230:49 0 28G 0 part
├─zd48p2 230:50 0 1K 0 part
└─zd48p5 230:53 0 4G 0 part
zd64 230:64 0 32G 0 disk
├─zd64p1 230:65 0 28G 0 part
├─zd64p2 230:66 0 1K 0 part
└─zd64p5 230:69 0 4G 0 part
zd80 230:80 0 32G 0 disk
├─zd80p1 230:81 0 28G 0 part
├─zd80p2 230:82 0 1K 0 part
└─zd80p5 230:85 0 4G 0 part
zd96 230:96 0 32G 0 disk
├─zd96p1 230:97 0 28G 0 part
├─zd96p2 230:98 0 1K 0 part
└─zd96p5 230:101 0 4G 0 part
zd112 230:112 0 32G 0 disk
├─zd112p1 230:113 0 28G 0 part
├─zd112p2 230:114 0 1K 0 part
└─zd112p5 230:117 0 4G 0 part
nvme0n1 259:0 0 477G 0 disk
├─nvme0n1p1 259:1 0 29.8G 0 part
├─nvme0n1p2 259:2 0 100G 0 part
├─nvme0n1p3 259:3 0 1K 0 part
├─nvme0n1p5 259:4 0 128G 0 part [SWAP]
├─nvme0n1p6 259:5 0 64G 0 part
└─nvme0n1p7 259:6 0 155.1G 0 part
root@zen:~#

Any pointers would be very much appreciated.

Thanks

 

[fabian]

you need to use the CLI or API, this is not available on the GUI. please also note that adding a local device prevents migration!

qm set VMID -SLOT /path/to/block/device/on/host

e.g.,

qm set 100 -scsi2 /dev/sda

 

[David Fell]

you need to use the CLI or API, this is not available on the GUI. please also note that adding a local device prevents migration!

qm set VMID -SLOT /path/to/block/device/on/host

e.g.,

qm set 100 -scsi2 /dev/sda

Ah, thank you! I shall try this when I get home this evening, but it makes sense.

 

[David Fell]

I now have the swap setup I was trying to achieve - thank you.

Migration probably isn't an issue for me (yet) as this is just my home server. But I will bear that in mind if it ever becomes relevant.