#!/bin/ksh -xv
#
# This script will perform ZFS filesystem snapshots
#
##########################################################################
#

ZFSFS=ZFSDATA1

function take_snapshot
{
 #       if zfs list -H -o name | grep $ZFSFS $1 >/dev/null 2>&1
  #      then
        zfs destroy $1
   #     fi
        zfs snapshot ${1}
}

case ${1} in
        "hourly")
                snap=hourly_$(date +%H)
                ;;
        "nightly")
                snap=nightly_$(date +%d)
                ;;
        "monthly")
                snap=monthly_$(($(date +%m)-1))
                ;;
esac

for fs in $(zfs list -H -o name -t filesystem | grep $ZFSFS)
do
        take_snapshot ${fs}@${snap}
done

# Add to crontab
#0 * * * * /ZFSDATA1/LOGS/ZFSsnapshot.ksh hourly
#59 23 * * * /ZFSDATA1/LOGS/ZFSsnapshot.ksh nightly
#1 0 1 * * /ZFSDATA1/LOGS/ZFSsnapshot.ksh monthly