Max support VM sizing

[Kafoof]

Hi, quick question. I am going to start evaluating Proxmox and I am just wondering what is the max support size of a VM in a proxmox 5.3 cluster?
e.g.

• Max Supported Memory Size of a VM?
• Max supported CPU Sockets of a VM?
  
• Max Supported vdisk size on CEPH RBD?
  
• Max Supported vdisk size on NFS?

Example of what I am looking for is similar to what VMware publishes:
h t t p s://configmax.vmware.com/guest

My cluster setup will be:

• 4 Hosts each with:
  
• 512gb of DDR4 Memory
• 2x 24C Xeon
• 5x 1.92tb Data center SSDs (SATA) for CEPH
• 40GbE network for storage network
• 10GbE network for data network

Thanks in advance!

 

[dcsapak]

• Max Supported Memory Size of a VM?

i believe the upper limit is about 4TB, but there is no hard limit in our config, only qemu/kvm limits this

• Max supported CPU Sockets of a VM?

as many sockets as your host has, and cores*sockets is also limited by your host

the upper limit for vm core count is 255

• Max Supported vdisk size on CEPH RBD?

afaik this is only limited by your cluster size, though very big images may not be practical (think eg. backup/restore)

• Max Supported vdisk size on NFS?

i believe the max size of a qcow2 file 2^64 byte ~ 16 EiB, but qemu-img says image size must be less then 8 EiB (8192 PiB)
though your nfs server file system is most probably the limit