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Hi Chris,
El 10/11/20 a las 10:53, Chris Hofstaedtler | Deduktiva escribió:
Hi,
* Eneko Lacunza via pve-user <[email protected]> [201110 09:03]:
I have hit a simple problem. Let be a VM with 3 disks, with .conf extract:
scsi0: ceph-proxmox:vm-100-disk-1,cache=writeback,size=6G
scsi1: ceph-proxmox:vm-100-disk-0,cache=writeback,size=400G
scsi2: ceph-proxmox:vm-100-disk-3,cache=writeback,size=400G
We have two virtual disks with identical size (400G).
How can I be sure what device on Linux guest is each?
You can also check - and use in /etc/fstab - the /dev/disk/by-*
symlinks.
In a VM, maybe the most relevant "id" is the actual path.
/dev/disk/by-path has these links (in my case):
pci-0000:06:05.0-scsi-0:0:0:0 -> sda
pci-0000:00:05.0-scsi-0:0:0:1 -> sdb
If your sdb/sdc are swapped, the SCSI IDs in the path should still
be correct.
lrwxrwxrwx 1 root root 9 Oct 29 15:24 pci-0000:00:05.0-scsi-0:0:0:0 ->
../../sda
lrwxrwxrwx 1 root root 10 Oct 29 15:24
pci-0000:00:05.0-scsi-0:0:0:0-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 Oct 29 15:24
pci-0000:00:05.0-scsi-0:0:0:0-part2 -> ../../sda2
lrwxrwxrwx 1 root root 10 Oct 29 15:24
pci-0000:00:05.0-scsi-0:0:0:0-part5 -> ../../sda5
lrwxrwxrwx 1 root root 9 Nov 10 09:08 pci-0000:00:05.0-scsi-0:0:0:1 ->
../../sdc
lrwxrwxrwx 1 root root 9 Oct 29 15:24 pci-0000:00:05.0-scsi-0:0:0:2 ->
../../sdb
Yes, they are.
If you don't like the pci path in there, /dev/disk/by-id has:
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0 -> sda
scsi-0QEMU_QEMU_HARDDISK_drive-scsi1 -> sdb
But you'll have to check if those match with the VM settings (I'd
expect them to).
lrwxrwxrwx 1 root root 9 Oct 29 15:24
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0 -> ../../sda
lrwxrwxrwx 1 root root 10 Oct 29 15:24
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 Oct 29 15:24
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part2 -> ../../sda2
lrwxrwxrwx 1 root root 10 Oct 29 15:24
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part5 -> ../../sda5
lrwxrwxrwx 1 root root 9 Nov 10 09:08
scsi-0QEMU_QEMU_HARDDISK_drive-scsi1 -> ../../sdc
lrwxrwxrwx 1 root root 9 Oct 29 15:24
scsi-0QEMU_QEMU_HARDDISK_drive-scsi2 -> ../../sdb
Those match too.
As you've discovered and others have said, lsscsi, or lsblk -S can
be used to see the SCSI IDs, too. The same info is also availabe
from udevadm: udevadm info /dev/sda
If you dig around in /sys, it's also there ;-)
Thanks for detailing more check options! :)
Cheers
--
Eneko Lacunza | +34 943 569 206
| [email protected]
Zuzendari teknikoa | https://www.binovo.es
Director técnico | Astigarragako Bidea, 2 - 2º izda.
BINOVO IT HUMAN PROJECT S.L | oficina 10-11, 20180 Oiartzun
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