Teradata Vantage on VMware currently supports 64 GB of reserved space on each virtual node for crashdumps, as required for support.
Depending on your workload and type of failure, a crashdump typically takes less than 3 GB of space. With 64 GB of reserved space, you should have enough space to support up to 7 crashdumps. However, in some circumstances crashdumps can be larger, such as full TPA crashdumps.