Hi,
| | The memory is used for read and write cache which improves the performance of the storage. The basic rule when it comes to cache is buy as much as you can afford. The more cache you have the better the performance of the disks will be as data can be written to the memory if the disks aren't in the correct position. You'll also want to make sure that the RAID card has a battery built on to protect the data in the write cache if there is a power outage. So this explains everything I guess |
#!/bin/bash
LIST="mnt lost+found media proc sys tmp"
function help {
echo "backup.sh source destination [exclude list] [-v]"
echo
echo -e "\tSource Path"
echo -e "\tDestination Path or [user@]host:[/path]"
echo -e "\t-v Be verbose"
echo -e "\tExclude list Comma separated list of folders to exclude 'foo bar'"
echo -e "\tDefault list $LIST"
echo
echo -e "Script does not cross filesystem boundaries"
}
[ $# -lt 1 ] && echo "Missing source" && help && exit 1
[ $# = 1 -a $1 = '-h' ] && help && exit 0
[ $# -lt 2 ] && echo "Missing destination" && help && exit 1
[ $# -gt 4 ] && echo "To many arguments" && help && exit 1
SRC=$1
DEST=$2
if [ $# -eq 3 ]; then
[ -n $3 ] && LIST="$3"
fi
ARGS="-arXSxh"
if [ $# = 4 ]; then
if [ $4 = '-v' ]; then
ARGS="$ARGS --progress"
else
echo "$4: Bad argument" && help && exit 1
fi
fi
EXCLUDE=""
for DIR in $LIST; do
EXCLUDE="$EXCLUDE --exclude '$DIR'"
done
echo "backing up $SRC to $DEST"
echo "using $EXCLUDE"
rsync $ARGS --stats $EXCLUDE "$SRC" "$DEST"
exit 0