example: I have created perf folder in my nfs data store and every second the free size percentage will be polled in to perf folder
/bin # cat getPerf.sh#!/bin/sh
########################################################
#
# getPerf.sh
#
# Gather necessary ESXi performance data.
# Permenantly store in _nfs_00/Perf/,
# Also forwards to syslog server for monitoring.
#
#
########################################################
#### Varibles ####
HOSTNAME=`hostname -s`
DATE=`date +%Y-%m-%d`
COWHEAP_ENTRY=`vsish -e ls /system/heaps/ |grep cow`
COWHEAP_FULLENTRY=/system/heaps/"$COWHEAP_ENTRY"stats
OUTPUTLOCATION=/vmfs/volumes/datastore_nfs_00/Perf
OUTPUTFILE=$OUTPUTLOCATION/COWHeap_"$HOSTNAME"_$DATE
COWHEAP_FREE=`vsish -e cat $COWHEAP_FULLENTRY | grep "percent free of max size:" |sed 's/percent free of max size://'`
#### Outputs ####
echo `date +%Y-%m-%d_%H:%M:%S;` $HOSTNAME $COWHEAP_FREE >> $OUTPUTFILE
logger -t COWHeap $HOSTNAME $COWHEAP_FREE
out put is as below
date and time Host name ( black marked) and free size
don't worry about the out put file size and it's about only 45KB per day.
how to schedule the script in ESXi.
just add your script in to your crontab root file as follow. here I have added my getperf.sh script to run every minute
for more details about crontab refer to this http://www.nncron.ru/help/EN/working/cron-format.htm
