KVM Virtualization Server - One physical disk(SSD) every virtual machine

In terms of performance, is it better to have one "big" SSD disk for several (lets say 5) virtualized guests, or a single smaller SSD disk for every virtual machine?

any general draw back having small disks?

Solution 1:

I guess it's not the disk itself that may be a performance bottleneck when multiple VMs will perform intensive disk operations simultaneously. It's the disk controller (or host adapter, to be precise).

If you have multiple disks on a single controller, it will impact performance in a similar way as if it were a single disk. It will be better than single disk, however not very much in my opinion.

And the possibility to add additional disk controllers is hardware dependent of course.