Having used Storage Foundation for some time, I take for granted the interpreting of disk and volume sector sizes into a more human friendly format such as Gigabyte (GB) & Terabyte (TB).
Fundamentally disks/LUNs use a sector as the granular unit of transfer, typically this is 512 bytes on Solaris, Linux & AIX and 1024bytes on HP-UX. Whilst that is great for disks, it is not easy on the human eye i.e 1 TB = 2,147,483,648 sectors (assuming 512byte/sector) and it takes a little maths to do the conversion from sectors to GB or TB.
Like disks, the Volume Manager Component (VxVM) of Storage Foundation also uses sectors and in the early versions that is what you had work if displaying volume sizes in the CLI. Fortunatley in later releases, we have introduced human friendly formats in the commands to aid ease of use. Below are some examples from a Linux system showing how human friendly formats can be used in displaying volumes and disks with the CLI: