lvsnapshot.sh

lvsnapshot.sh

#!/bin/bash 

DATE=`date +"%a"`
DVOLNAME=datalv
LVOLNAME=journallv
VOLGR=datavg
DVOLPATH=/dev/$VOLGR/$DVOLNAME
LVOLPATH=/dev/$VOLGR/$LVOLNAME
DSNAME=`echo ${DVOLNAME}_ss_${DATE} | tr '[A-Z]' '[a-z]'`
LSNAME=`echo ${LVOLNAME}_ss_${DATE} | tr '[A-Z]' '[a-z]'`
DSNAPSHOT=/dev/$VOLGR/$DSNAME
LSNAPSHOT=/dev/$VOLGR/$LSNAME
DSIZE="5GB"
LSIZE="2GB"


if [ -e $DSNAPSHOT ]
then
        /bin/umount $DSNAPSHOT > /dev/null 2>&1
        /sbin/lvremove -f $DSNAPSHOT > /dev/null 2>&1
fi

if [ -e $LSNAPSHOT ]
then
        /bin/umount $LSNAPSHOT > /dev/null 2>&1
        /sbin/lvremove -f $DSNAPSHOT > /dev/null 2>&1
fi

/sbin/lvcreate -L$DSIZE -s -n $DSNAPSHOT $DVOLPATH > /dev/null 2>&1

if [ $? = 0 ]
then
        echo "Snapshot $DSNAPSHOT Created"
else
        echo "Snapshot $DSNAPSHOT Failed"
fi

/sbin/lvcreate -L$LSIZE -s -n $LSNAPSHOT $LVOLPATH > /dev/null 2>&1

if [ $? = 0 ]
then
  echo "Snapshot $LSNAPSHOT Created"
else
  echo "Snapshot $LSNAPSHOT Failed"
fi

If your database and journal are on different filesystems, you need to run db.fsyncLock() before creating the snapshots to ensure a consistent backup. See the bottom of http://docs.mongodb.org/manual/tutorial/backup-with-filesystem-snapshots/