make_recovery问题

songyang100

请问我这样备份能行吗？
make_recovery -C -A -d /dev/rmt/0mn

VG00大约32G左右
用一个24G的磁带 做了一次 提示成功

后来有用8G的磁带
make_recovery -C -A -d /dev/rmt/0m
也做了一次也提示成功（这次是0m不是0mn）

好象听人说用
make_recovery -A的话 磁带的容量要比VG00大

可是为什么我做两次都提示成功呢？
这样做出来的恢复磁带能好用吗？
以下是我做备份的提示信息
NOTE:    make_recovery(103): The make_recovery command will be replaced by
         make_tape_recovery.  Both commands are supported in this
         release (Ignite-UX Revision 3.2).  Please read the man page
         make_tape_recovery(1M) for usage of the new command.  In a
         future release, make_recovery will be replaced by a script
         that calls make_tape_recovery.
      Option -A specified. Entire Core Volume Group/disk will be backed up.
NOTE:    vgdisplay -v unsuccessful
NOTE:    vgdisplay -v unsuccessful
NOTE:    vgdisplay -v unsuccessful
NOTE:    vgdisplay -v unsuccessful
NOTE:    vgdisplay -v unsuccessful
NOTE:    vgdisplay -v unsuccessful




      ***************************************
       HP-UX System Recovery


       Going to create the tape.
       System Recovery Tape successfully created.