#!/usr/bin/bash

# Modify the above line to reflect the actual location of bash on your
# system, which you can determine with the command "which bash". E.g.
# for Solaris 7, it may be /usr/local/bin/bash. You
# will get a "not found" error message if it is incorrect.

# Name: soldiskspace
# Author: Sandra Henry-Stocker, ITworld.com <sandra @ toadmail.com>
# Modified By: Jim Cameron <scripts @ moonpoint.com>
# Last Modified: June 28, 2006
# Version 1.1

# Obtained from: http://www.itworld.com/Comp/1375/nls_unixcalculate041223/
# Obtained on: June 28, 2006

# This script displays usable disk space on a Solaris system, but not 
# necessarily the totality of disk space on the system.  A system with 
# mirrored disks, for example, will appear to have half as much disk space as 
# it actually contains.

# This script and an explanation of how it works appears in 
# an article titled "Calculating overall disk space", which appeared in
# "ITworld.com, Unix in the Enterprise 12/23/04" at
# http://www.itworld.com/Comp/1375/nls_unixcalculate041223/ 

# Modifications:

# 6/28/2006 Replaced "who am i" check with a "whoami" check instead, since
# "who am i" will not return "root" if you have su'ed to the root account,
# but "whoami" will return "root".

# ---- some of the commands used by this script are privileged ----
if [ `/usr/ucb/whoami` != "root" ]; then
    echo Sorry, this script must be run by root
    exit 1
fi

# calculate disk space using prtvtoc disk geometry details

# ---- first, get list of disks ----
disks=( `ls /dev/rdsk/c*s2` )
total=0;

# ---- how many disks? ----
sz=${#disks[*]}

# ---- get disk size for each ----
n=0
echo "Disks:"

while [ $n -lt $sz ]
do
    geom=( `prtvtoc ${disks[$n]} 2>/dev/null | egrep "sector|track|cylinder" | tr -d "*" | awk '{print $1}'` )

    # ---- get disk parms and calculate size ----
    BperS=${geom[0]}
    SperT=${geom[1]}
    TperC=${geom[2]}
    SperC=${geom[3]}
    Cyls=${geom[4]}
    AccCyls=${geom[5]}

    if [ "$BperS" != "" ]; then
        size=`expr $BperS \* $SperC \* $Cyls`
        GB=`expr $size \/ 1024 \/ 1024 \/ 1024`
        echo -n "    ${disks[$n]}: "
        echo $GB "Gbytes"
        total=`expr $total + $GB`
    fi

    n=`expr $n + 1`
done

echo "    TOTAL: $total GB"