Solaris – increase tmpfs /tmp on the fly

24 Jan 2011

A useful script from BigAdmin for increasing the size of a tmpfs /tmp without rebooting.
#!/bin/ksh
if [ $# -ne 1 ]; then
    echo ""
    echo "tUsage: $0 newsize"
    echo ""
    echo "Where newsize is the size in kilobytes (default) that you want /tmp to be"
    echo "Alternatively you can specify size in (p)ages (m)egabytes or (g)igabytes"
    echo ""
    exit
fi

if [ -z `id | grep "uid=0"` ]; then
    echo "ERROR -- you must be root to run this script"
    exit
fi

pagesize=`pagesize`
pagesize=$(( $pagesize / 1024 ))
echo "Pages are ${pagesize}K"

newsize=`echo $1 |sed -e 's/([kKmMgGpP])/ 1/' | tr '[a-z]' '[A-Z]'`
type=`echo "$newsize" | awk '{print $2}'`
newsize=`echo "$newsize" | awk '{print $1}'`

case "$type" in
    P) newsize=$(( $newsize * $pagesize ))
        ;;
    M) newsize=$(( $newsize * 1024 ))
        ;;
    G) newsize=$(( $newsize * 1024 * 1024 ))
        ;;
esac

if [ "$newsize" -lt 102400 ]; then
    echo "ERROR -- this script won't let you go below 100MB (102400K)"
    echo ""
    exit
fi

tmp_size=`df -k /tmp | grep ^swap | awk '{print $2}'`
if [ "$tmp_size" -eq 0 ]; then
    echo "Error, cannot get size reading on /tmp"
    exit
fi

tmp_pages=$(( $tmp_size / $pagesize ))
echo "/tmp is ${tmp_size}K (${tmp_pages} pages)"

newsize_pages=$(( $newsize / $pagesize ))
echo "/tmp will be resized to ${newsize}K (${newsize_pages})"

if [ "$tmp_size" -gt "$newsize" ]; then
    echo "ERROR -- this script cannot be used to shrink /tmp"
    echo ""
    exit
fi

tmp_addresses=`echo "vfs" | crash | grep tmpfs | awk '{print $6}'`
if [ -z "$tmp_addresses" ]; then
    echo "Ach, cannot get addressed from crash..."
    exit
fi
for i in $tmp_addresses; do
    echo "Looking at address $i"
    mysize=`echo "${i}+18/e" | adb -k | grep -v physmem | awk '{print $2}'`
    if [ "$mysize" -eq tmp_pages ]; then
        if [ -z "$foundit" ]; then
            echo "Looks like $i is the one!"
            foundit=$i
        else
            echo "Interesting!  Looks like there's more than one match."
            echo "You're going to have to do this by hand"
            exit
        fi
    fi
done
if [ -z "$foundit" ]; then
    echo "Error -- cannot locate a tmpfs filesystem that's the size of /tmp"
    exit
fi

echo "Before:"
df -k /tmp
echo "${foundit}+18/Z 0T${newsize_pages}" | adb -k -w
#echo "${foundit}+18/Z 0T${newsize_pages}"
echo "After:"
df -k /tmp

##############################################################################
### This script is submitted to BigAdmin by a user of the BigAdmin community.
### Sun Microsystems, Inc. is not responsible for the
### contents or the code enclosed.
###
###
###  Copyright Sun Microsystems, Inc. ALL RIGHTS RESERVED
### Use of this software is authorized pursuant to the
### terms of the license found at
### http://www.sun.com/bigadmin/common/berkeley_license.jsp
##############################################################################


          


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Sonia Hamilton - Blog

Solaris – increase tmpfs /tmp on the fly

24 Jan 2011
