nvme partition to kvm quest as storage device

[pwl]

I have a NVME disk partitioned to some paritions.
One partition used for bcache, and another two i want use inside two KVM guests directly for mysql.

how can I set it up?
I see "cloop" options, but can't understand it.

 

[Jeff Billimek]

I pass an nvme device partition to a KVM guest for kubernetes rook/ceph and it works great. This is how I did it:

For a given nvme partition, (in this case nvme0n1p4 which is identified as /dev/disk/by-id/nvme-Samsung_SSD_960_EVO_500GB_S3X4NB0K206387N-part4) added the following to the /etc/pve/qemu-server/<vmid>.conf:

scsi1: /dev/disk/by-id/nvme-Samsung_SSD_960_EVO_500GB_S3X4NB0K206387N-part4,backup=0,discard=on,replicate=0,size=9574M

This shows up in the guest VM as (via lsblk):

sdb 8:16 0 9.4G 0 disk

via parted:

$ sudo parted /dev/sdb print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sdb: 10.0GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name           Flags
 1      1049kB  605MB   604MB                ROOK-OSD0-WAL
 2      605MB   1679MB  1074MB               ROOK-OSD0-DB

 

[pwl]

ok. guest is started with this parameters but seems ignored.


I haven't lsblk command in this old linux 2.6.38-16-generic #67~lucid1-Ubuntu
Other virtio drivers works ok.

but how find device in guest?

config:

agent: 1
boot: cdn
bootdisk: virtio0
cores: 8
ide2: none,media=cdrom
memory: 32000
name: vsup
net0: virtio=5A:0B:CE:5F:01:78,bridge=vmbr0
numa: 0
ostype: l26
scsihw: virtio-scsi-pci
smbios1: uuid=af67a777-33f6-4b6b-81ee-b5ac3cded4dd
sockets: 2
virtio0: local:101/vm-101-disk-1.qcow2,size=200G
virtio1: local:101/vm-101-disk-2.qcow2,cache=writeback,size=1500G
virtio2: raw6:101/vm-101-disk-1.raw,size=138G (another Raw file on nvme partition for test , not fast)
scsi1: /dev/disk/by-id/nvme-Samsung_SSD_970_EVO_500GB_S466NX0K523886P-part5,backup=0,size=102400M
(this is new)

lspci didn't not show it.
blkid didn't show it .

00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Technical Corp. Device 1111 (rev 02)
00:03.0 Unclassified device [00ff]: Qumranet, Inc. Virtio memory balloon
00:05.0 SCSI storage controller: Qumranet, Inc. Device 1004
00:08.0 Communication controller: Qumranet, Inc. Virtio console
00:0a.0 SCSI storage controller: Qumranet, Inc. Virtio block device
00:0b.0 SCSI storage controller: Qumranet, Inc. Virtio block device
00:0c.0 SCSI storage controller: Qumranet, Inc. Virtio block device
00:12.0 Ethernet controller: Qumranet, Inc. Virtio network device
00:1e.0 PCI bridge: Red Hat, Inc. Device 0001
00:1f.0 PCI bridge: Red Hat, Inc. Device 0001

 

[pwl]

ok, driver changed to virtio
but not sow good results: raw host 90k write iops.
virtio partition : write: io=8,192MB, bw=97,365KB/s, iops=24,341