下面的 script 就是利用 xfsdump, bzip2, dd 備份資料到磁帶上. 備份後會測試一次, 以確定資料完整.

 #!/bin/sh

# 磁帶機的裝置名稱
TAPE_DEV="/dev/nst0"

# null 裝置名稱
NULL_DEV="/dev/null"

# 指令檔存放的路徑
CMD_PATH="/etc/backup"

# 磁帶的區塊大小 (TR-5 使用 9-65536, 備份與還原必須使用相同設定)
# 配合壓縮軟體與 dd 時, 若設定過大會有問題
BLOCK_SIZE=1024

# 備份的等級, 0 為完全備份
BACKUP_LEVEL=0

# 備份時顯示的間格秒數
TIME_DISPLAY=300

# 備份的指令檔
DUMP_CMD="/usr/sbin/xfsdump"

# 還原備份的指令檔
RESTORE_CMD="/usr/sbin/xfsrestore"

# mt 指令
MT_CMD="/bin/mt"

# dd 指令
DD_CMD="/bin/dd"

# 壓縮程式
ZIP_CMD="/usr/bin/bzip2"

# ls 指令
LS_CMD="/bin/ls"

# head 指令
HEAD_CMD="/usr/bin/head"

# 備份路徑設定檔
# 檔案格式如下:
# <device>              <session>               <before cmd>    <after cmd>
#/dev/hda1               /
#/dev/vg01/ora          /home/oracle            oracle_stop     oracle_start
VOLS_INCL_FILE="${CMD_PATH}/vols.include.xfsdump"

if [ -f ${VOLS_INCL_FILE} ]; then
  date
  echo "---------------------------------------------------------------"
  echo "如果要還原備份資料, 可以使用下面的指令:"
  echo "${DD_CMD} bs=${BLOCK_SIZE} conv=sync if=${TAPE_DEV} |  "
  echo "  ${ZIP_CMD} -dqv |  "
  echo "  ${RESTORE_CMD} -p ${TIME_DISPLAY} -J - /path/to/restore/"
  echo "---------------------------------------------------------------"
  echo

  echo "---------------------------------------------------------------"
  echo "列出本檔案的內容 - ${0}"
  echo "---------------------------------------------------------------"
  cat ${0}
  echo "---------------------------------------------------------------"
  echo "檔案結束!"
  echo "---------------------------------------------------------------"
  echo

  echo "---------------------------------------------------------------"
  echo "將磁帶回轉, 並設定區塊大小"
  echo "cmd: ${MT_CMD} -f ${TAPE_DEV} retension"
  echo "cmd: ${MT_CMD} -f ${TAPE_DEV} rewind"
  echo "cmd: ${MT_CMD} -f ${TAPE_DEV} setblk ${BLOCK_SIZE}"
  echo "---------------------------------------------------------------"
  echo
  ${MT_CMD} -f ${TAPE_DEV} retension
  ${MT_CMD} -f ${TAPE_DEV} rewind
  ${MT_CMD} -f ${TAPE_DEV} setblk ${BLOCK_SIZE}

  echo "---------------------------------------------------------------"
  echo "載入設定檔: ${VOLS_INCL_FILE}"
  index=0
  declare -a device_names
  declare -a session_names
  declare -a before_cmds
  declare -a after_cmds
  exec 9<&0
  exec <${VOLS_INCL_FILE}
  while read DEVICE_NAME SESSION_NAME BEFORE_CMD AFTER_CMD
  do
    case "${DEVICE_NAME}" in
      ""|#*)
         continue;
         ;;
    esac
    device_names[$index]=${DEVICE_NAME}
    session_names[$index]=${SESSION_NAME}
    before_cmds[$index]=${BEFORE_CMD}
    after_cmds[$index]=${AFTER_CMD}
    let "index += 1"
  done
  echo "共有 ${index} 個檔案系統要備份!"
  echo "---------------------------------------------------------------"
  exec 0<&9 9<&-

  num=0
  while [ "$num" -lt "$index" ]; do
    DEVICE_NAME=${device_names[$num]}
    SESSION_NAME=${session_names[$num]}
    BEFORE_CMD=${before_cmds[$num]}
    AFTER_CMD=${after_cmds[$num]}
    let "num += 1"

    date
    echo "---------------------------------------------------------------"
    echo "備份 ${DEVICE_NAME} 到磁帶 ${TAPE_DEV} 中..."
    echo "---------------------------------------------------------------"
    if [ "${BEFORE_CMD}" != "" ]; then
      echo " *** 執行備份前置指令: ${CMD_PATH}/${BEFORE_CMD}"
      ${CMD_PATH}/${BEFORE_CMD}
    fi
    echo " *** 開始備份..."
    echo "cmd: ${DUMP_CMD} 
-l ${BACKUP_LEVEL} 
-o 
-p ${TIME_DISPLAY} 
-J 
-F 
-M weekly_backup 
-L ${SESSION_NAME} 
- ${DEVICE_NAME} | 
${ZIP_CMD} -9qv | 
${DD_CMD} bs=${BLOCK_SIZE} conv=sync of=${TAPE_DEV}"
    ${DUMP_CMD} 
-l ${BACKUP_LEVEL} 
-o 
-p ${TIME_DISPLAY} 
-J 
-F 
-M weekly_backup 
-L ${SESSION_NAME} 
- ${DEVICE_NAME} | 
${ZIP_CMD} -9qv | 
${DD_CMD} bs=${BLOCK_SIZE} conv=sync of=${TAPE_DEV}
    echo " *** 備份完成!"
    if [ "${AFTER_CMD}" != "" ]; then
      echo " *** 執行備份後置指令: ${CMD_PATH}/${AFTER_CMD}"
      ${CMD_PATH}/${AFTER_CMD}
    fi
  done

  date
  echo "---------------------------------------------------------------"
  echo "備份完成!"
  echo "---------------------------------------------------------------"

  echo "---------------------------------------------------------------"
  echo "將磁帶回轉"
  echo "cmd: ${MT_CMD} -f ${TAPE_DEV} rewind"
  echo "---------------------------------------------------------------"
  echo
  ${MT_CMD} -f ${TAPE_DEV} rewind

  num=0
  lnum=0
  while [ "$num" -lt "$index" ]; do
    DEVICE_NAME=${device_names[$num]}
    SESSION_NAME=${session_names[$num]}
    BEFORE_CMD=${before_cmds[$num]}
    AFTER_CMD=${after_cmds[$num]}
    let "num += 1"

    date
    echo "---------------------------------------------------------------"
    echo "測試備份內容 ${DEVICE_NAME}"
    echo "---------------------------------------------------------------"
    echo "cmd: ${DD_CMD} bs=${BLOCK_SIZE} conv=sync if=${TAPE_DEV} | ${ZIP_CMD} -tqv"
    ${DD_CMD} bs=${BLOCK_SIZE} conv=sync if=${TAPE_DEV} | ${ZIP_CMD} -tqv
    echo
    echo "---------------------------------------------------------------"
    echo "如果要還原備份資料, 可以使用下面的指令:"
    echo "${MT_CMD} -f ${TAPE_DEV} rewind"
    echo "${MT_CMD} -f ${TAPE_DEV} fsf ${lnum}"
    echo "${DD_CMD} bs=${BLOCK_SIZE} conv=sync if=${TAPE_DEV} |  "
    echo "  ${ZIP_CMD} -dqv |  "
    echo "  ${RESTORE_CMD} -p ${TIME_DISPLAY} -J - /path/to/restore/"
    echo "---------------------------------------------------------------"
    echo
    let "lnum += 1"
  done
fi

date
echo "---------------------------------------------------------------"
echo "將磁帶回轉"
echo "cmd: ${MT_CMD} -f ${TAPE_DEV} rewind"
echo "---------------------------------------------------------------"
echo
${MT_CMD} -f ${TAPE_DEV} rewind

date
exit 0