Lvm-thin NoBackups etc

Jospeh Huber

Active Member
Apr 18, 2016
98
5
28
43
Hi,

I am not new to proxmox but new to lvm-thin ;-):

I have setup the a new node with the brand new proxmox 4.2.
The server has about 3.8 TB Disk space.
The installer creates two "storages" in proxmox:
"local" with about 100Gb
"local-thin" with 3.8 Gb lvm thin
On the lvm-thin storage I cannot configure to use it also for "VZDumps and Templates " and so on.
So the installer configured "bigstorage" is only usable for vmimages...

I saw, that the advantage of lvm-thin is the possibility to take snapshots...
At the moment i do not need this, is there away to get rid of this?
I would prefer to remove this lvm-thin volume and extend the main volume with the free space...

/# lvremove -t data
TEST MODE: Metadata will NOT be updated and volumes will not be (de)activated.
Volume group "data" not found
Cannot process volume group data
 

kinetica

Member
May 9, 2014
24
1
21
Hi,
why is not possible to create VZDumps and Templates? I have just installed Proxmox 4.2 and is what I am trying to understand.
I have a lot of local space but I do not understand how to use it.
 

Jospeh Huber

Active Member
Apr 18, 2016
98
5
28
43
My Problem is now that I want to use SSDs for my VMs (LXC) ... :eek:
I see you have to use LVM-thin if you want vzdumps with snapshots, otherwise the vzdump runs in suspended mode => vm not reachable.
My first step was to configure the ssd as normal lvm storage (as described here https://pve.proxmox.com/wiki/Storage_Model#LVM_Groups_with_Local_Backing)
Partition with fdisk
pvcreate /dev/sdb1
vgcreate ssd /dev/sdb1
Configure it as LVM storage via the webgui

I found here, howto convert the pve/data group to lvm-thin
https://forum.proxmox.com/threads/best-way-to-convert-lvm-to-lvm-thin.27204/:
lvconvert --type thin-pool pve/data

lvconvert --type thin-pool ssd
Please provide a valid volume group name
Run `lvconvert --help' for more information.
I think the problem is that there is only a volume group but no logical volume (that's what proxmox does automatically...)

I have removed and backedUp all vms, so how can i do a new thin provisioning or convert my ssd space to thin?

BTW: I am not the onlyone with "thin" problems ;-)
https://forum.proxmox.com/threads/local-lvm-storage-and-vm-format.27209/#post-137066
 
Last edited:

Jospeh Huber

Active Member
Apr 18, 2016
98
5
28
43
Hi,

thanks for your hint!
I have succesfully created the logical volume.
But now in the webgui i can select the Volume Group but I cannot select anything in Thin Pool. Why?

lvcreate -l +100%FREE -T ssd/ssd



--- Logical volume ---
LV Name ssd
VG Name ssd
LV UUID 3ip7my-De56-Sjhq-tMqw-pGIZ-WZBU-LASo21
LV Write Access read/write
LV Creation host, time xxxxx, 2016-05-10 10:31:09 +0200
LV Pool metadata ssd_tmeta
LV Pool data ssd_tdata
LV Status available
# open 0
LV Size 892.91 GiB
Allocated pool data 0.00%
Allocated metadata 0.43%
Current LE 228586
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:5
 

Jospeh Huber

Active Member
Apr 18, 2016
98
5
28
43
Another Problem while restoring a VM to the new LVM-thin Storage
/usr/sbin/thin_check: execvp failed: No such file or directory

Strange... on one of my nodes i have to install the thin-provisioning-tools:
apt-get install thin-provisioning-tools
 

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