VM and maximum number of block devices

[bandzior]

Hello.

unfortunately I can't find information about the maximum number of block devices that can be configured for a virtual machine in PROXMOX 7.x.

So, what is the maximum amount of block devices - mainly SCSI that can be added to a virtual machine?

Best
Daniel

 

[Stoiko Ivanov]

So, what is the maximum amount of block devices - mainly SCSI that can be added to a virtual machine?

can be found in the manpage of qm - `man qm`
scsi: 31
virtio: 16
sata: 6
ide: 4

I hope this helps!

 

[bandzior]

Thx. Can these values be summed up?

 

[Stoiko Ivanov]

Thx. Can these values be summed up?

You should be able to use them in parallel yes...

out of curiosity - why do you want to have this many disks in a VM instead of e.g. using a larger disk?

 

[bandzior]

I need mamy 20TB wolumes with many files. As we counted number of files, we choosed to use 20TB wolumes.

 

[LnxBil]

I need mamy 20TB wolumes with many files. As we counted number of files, we choosed to use 20TB wolumes.

unfortunately, this is not an answer.

What problems did you have with many files on a huge system? It is no problem in having 3 or 4 digit TB pools with ZFS.

 

[bandzior]

We cant use ZFS...

 

[LnxBil]

We cant use ZFS...

any other filesystem is also OK. Still don't know what problems you faced.

 

[sandor]

I also need to use separate disks instead of a single huge volume.
In my setup it turned out moving a huge single disk (around 500GB-1TB) from a smb shared storage to the proxmox local hdd lvm makes the system hang for a long period of time while the process first fills that amount with zeros, even as i using a thin lvm pool.
My proxmox is old, but now until i upgrading it i have no other choice.