6-4-1 本機對本機實做

1. 先查詢目前已建立的 snapshot
   1. root@debian8:~# zfs list -t snapshot
      NAME                                   USED  AVAIL  REFER  MOUNTPOINT
      backup/samba@GMT-2017.07.04-13.45.57    80K      -   152K  -
      zfs/samba@GMT-2017.07.04-13.45.57       80K      -   152K  -
       
   2. 將 zfs/samba 及 backup/samba 所有的快照刪除
      root@debian8:~# zfs destroy backup/samba@GMT-2017.07.04-13.45.57
      root@debian8:~# zfs destroy zfs/samba@GMT-2017.07.04-13.45.57
       
2. 製作快照：將要傳送的資料池(dataset, 相當於分割區的概念)製作快照
   1. root@debian8:~# zfs snapshot -r zfs/samba@GMT-`date -u +%Y.%m.%d-%H.%M.%S`
      root@debian8:~# zfs list -t snapshot
      NAME                                USED  AVAIL  REFER  MOUNTPOINT
      zfs/samba@GMT-2017.07.04-14.25.00      0      -   152K  -
       
   2. 查看目前 /zfs/samba 底下的目錄及檔案

      root@debian8:~# tree /zfs/samba/
      /zfs/samba/
      └── 01-教導處
          ├── 01-教務主任
          ├── 02-教務組長
          ├── 03-設備組長
          └── 04-訓導組長

      5 directories, 0 files
      

3. 將 /backup/samba 目錄底下清空
   root@debian8:~# rm /backup/samba/* -rf
   root@debian8:~# ls -alF /backup/samba/
   總計 17
   drwxr-xr-x 2 root root 2  7月  4 22:29 ./
   drwxr-xr-x 4 root root 5  7月  4 21:55 ../
    

4. 將 dataset zfs/samba 建立的快照 zfs/samba@GMT-2017.07.04-14.25.00
   透過網路 以zfs 複製/備份 到
   另一台主機 "(現在以本機 localhost 來模擬操作) 的 backup/samba dataset
   
   root@debian8:~# zfs send zfs/samba@GMT-2017.07.04-14.25.00 | ssh localhost zfs receive backup/samba
   The authenticity of host 'localhost (::1)' can't be established.
   ECDSA key fingerprint is 68:82:38:50:e1:f7:44:67:2c:8a:48:bf:b5:c5:ba:c5.
   Are you sure you want to continue connecting (yes/no)? yes
   Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
   root@localhost's password:
   cannot receive new filesystem stream: destination 'backup/samba' exists
   must specify -F to overwrite it
   root@debian8:~# zfs send zfs/samba@GMT-2017.07.04-14.25.00 | ssh localhost zfs receive backup/samba -F
   root@localhost's password:
   cannot receive new filesystem stream: I/O error
    

5.  

   查看目前 /backup/samba 底下的目錄及檔案

   /backup/samba/
   └── 01-教導處
       ├── 01-教務主任
       ├── 02-教務組長
       ├── 03-設備組長
       └── 04-訓導組長

   5 directories, 0 files
    

6. 查看目前的快照(快照也會同時複製到遠端)
   root@debian8:~# zfs list -t snapshot
   NAME                                   USED  AVAIL  REFER  MOUNTPOINT
   backup/samba@GMT-2017.07.04-14.25.00    80K      -   152K  -
   zfs/samba@GMT-2017.07.04-14.25.00       80K      -   152K  -