Can´t mount USB device/can´t add LVM

[KnowVation]

Hello!

I try to add an usb-stick to one node of our five-node Cluster with ceph.
I used the doku from here: https://pve.proxmox.com/wiki/Storage_Model
My usb device is 8 GB and i want to copy all /etc files from my nodes to the extern media usb device.

At the Point to create lvm over the gui, the lvm volume "usb-stick" is not shown in the tab "Volume Group". i marked only the node where the usb stick is plugged.

Can anyone tell me why?

Thanks in advance,

Roman

 

[t.lamprecht]

Hi!

To be sure I understand you correctly want exactly do you want to do? Backing up the configuration directories (/etc) of you Nodes?

You would need to mount it to a mountpoint and then you could copy everything to the stick, e.g.:

# create directory where we mount the stick
mkdir /mnt/usb

# mount it (replace sdX with the respective device, e.g. exec dmesg to see which device the usb stick is)
mount /dev/sdX /mnt/usb

# copy files
cp -R /etc /mnt/usb

# unmount it when done
umount /mnt/usb

After you mounted the stick could also add it as a storage to PVE through the GUI, this could be useful if you want to make a backup from a VM to the stick.
But for backing up the nodes /etc the above shown method is needed.

 

[KnowVation]

Thanks for you answer Thomas!

I have one question about the filesystem on the usb stick. Yes, u r right, to copy all important files from the nodes to the stick!
When i try to mount the stick, this error is shown:

Device  Boot Start  End  Sectors  Size Id Type
/dev/sdf1  2048 15730687 15728640  7.5G 83 Linux

root@HUSKY04:/# mount /dev/sdf1 /mnt/usb
mount: wrong fs type, bad option, bad superblock on /dev/sdf1,
  missing codepage or helper program, or other error

  In some cases useful info is found in syslog - try
  dmesg | tail or so.

root@HUSKY04:/# dmesg | tail
[2232776.521226] sd 10:0:0:0: Attached scsi generic sg5 type 0
[2232776.521845] sd 10:0:0:0: [sdf] 15730688 512-byte logical blocks: (8.05 GB/7.50 GiB)
[2232776.522482] sd 10:0:0:0: [sdf] Write Protect is off
[2232776.522484] sd 10:0:0:0: [sdf] Mode Sense: 23 00 00 00
[2232776.523147] sd 10:0:0:0: [sdf] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[2232776.526863]  sdf: sdf1
[2232776.528772] sd 10:0:0:0: [sdf] Attached SCSI removable disk
[2234294.974184]  sdf:
[2234372.424490]  sdf: sdf1
[2255060.020732]  sdf: sdf1
root@HUSKY04:/#

What i am doing wrong, or is the stick not ok?

Thanks,

Roman

 

[t.lamprecht]

Hi,

What i am doing wrong, or is the stick not ok?

Hmm, I'd say the latter one, the commands where correct, does the stick work fine on a desktop PC?
Else you could also format it with vfat to allow windows/linux/mac compatibility:

mkfs.fat /dev/sdf1

If it still has problems write a new partition table before formatting again, e.g. with fdisk or gdisk or format the drive on a desktop PC with GUI programs (e.g. Gparted) which may be easier and safer if no experience with the command line tools.