Even though default partition option is okay but when dealing with production servers I rather have my own partitions written down with standard 2048MB for each basic paritions and 6144MB for my root partition and the rest of disk spaces will be formatted with VMFS3 with option to "Fill maximum" disk space left so it uses all for VMFS.
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Regards,
Stefan Nguyen
iGeek Systems LLC.
VMware, Citrix, Microsoft Consultant