[SOLVED] Some questions about the new "LVM-Thin" thing

[ohmer]

Hello,

I have some difficulties to understand how the "LVM-Thin" thing work. Seem like the old /var/lib/vz doesn't hold container data anymore. They are stored in a "thin lvm volume". Right?

/var/lib/vz is now just a directory created on pve-root volume and this is where we stock vzdump, iso and templates. I'm still right?

With this setup, is it still required to keep free space in my volume group to allow snapshot backup to work?

I installed Proxmox VE on a hard drive. I also have a SSD where I want to stock data for some container in order to get some performance gain. Should I create a new volume group and then configure a new "LVM-thin" stockage in the Proxmox VE web UI?

Thanks.

 

[fabian]

Hello,

I have some difficulties to understand how the "LVM-Thin" thing work. Seem like the old /var/lib/vz doesn't hold container data anymore. They are stored in a "thin lvm volume". Right?

/var/lib/vz is now just a directory created on pve-root volume and this is where we stock vzdump, iso and templates. I'm still right?

With this setup, is it still required to keep free space in my volume group to allow snapshot backup to work?

I installed Proxmox VE on a hard drive. I also have a SSD where I want to stock data for some container in order to get some performance gain. Should I create a new volume group and then configure a new "LVM-thin" stockage in the Proxmox VE web UI?

Thanks.

yes, yes, no (but you need to increase the pool metadata volume if you increase the pool size, otherwise many snapshots/clones will cause problems), and yes, create a new VG + thinpool and configure it as additional storage (there will be a wiki article how to do this soon).

 

[LnxBil]

You can also revert to the old non-lvm-thin-storage if you do not want to struggle with it.

https://pve.proxmox.com/wiki/Instal....2Fvar.2Flib.2Fvz_.28Proxmox_4.2_and_later.29

What is your current setup with respect to disk and SSD? Maybe a SSD-Cache would also work very well for you.

 

[ohmer]

yes, yes, no (but you need to increase the pool metadata volume if you increase the pool size, otherwise many snapshots/clones will cause problems), and yes, create a new VG + thinpool and configure it as additional storage (there will be a wiki article how to do this soon).

Thanks fabian.

What is your current setup with respect to disk and SSD? Maybe a SSD-Cache would also work very well for you.

This is my first Proxmox server with ssd drive. How work ssd-cache? Does it require ZFS (currently using ext4).

 

[LnxBil]

This is my first Proxmox server with ssd drive. How work ssd-cache? Does it require ZFS (currently using ext4).

You can use LVMCache if you're using LVM.