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[linux-lvm] how to move data from one PV to other PV automaticly?



hi,all:
    i have a VG with 3 PV.
here is 'pvdisplay' information:
 
------------------------------------------------
 
ftp:~# pvdisplay -v
    Scanning for physical volume names
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               nicvg
  PV Size               838.09 GB / not usable 0  
  Allocatable           yes (but full)
  PE Size (KByte)       32768
  Total PE              26819
  Free PE               0
  Allocated PE          26819
  PV UUID               IyahCr-NwPt-dUsC-UuVa-ki1y-5X4X-NRReLA
  
  --- Physical volume ---
  PV Name               /dev/sdc1
  VG Name               nicvg
  PV Size               558.72 GB / not usable 0  
  Allocatable           yes (but full)
  PE Size (KByte)       32768
  Total PE              17879
  Free PE               0
  Allocated PE          17879
  PV UUID               NG6cMz-I12Q-6X8T-58gn-Fvov-gYs9-HCvYyw
  
  --- Physical volume ---
  PV Name               /dev/sdd1
  VG Name               nicvg
  PV Size               558.72 GB / not usable 0  
  Allocatable           yes (but full)
  PE Size (KByte)       32768
  Total PE              17879
  Free PE               0
  Allocated PE          17879
  PV UUID               qqm9Ua-5owd-ZhVM-nU5D-wZeL-klu1-t0Ij68
 
-----------------------------------------------------------------------
 
i want to move all data from /dev/sdb1 to another two PV (/dev/sdc1 and /dev/sdd1) automaticly.
so i can remove the unstable PV /dev/sdb1 and repair it.
then i will restore a new /dev/sdb1 device.
 
the disk space is all right.
here is 'df' information:
 
---------------------------------
 
ftp:~# df
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5             1.9G  545M  1.4G  29% /
tmpfs                1014M  4.0K 1014M   1% /dev/shm
/dev/sda1              95M   39M   56M  42% /boot
/dev/sda6              14G  444M   14G   4% /var
/dev/mapper/nicvg-niclv
                      2.0T  774G  1.2T  40% /ftproot
 
---------------------------------
 
the volumn '/dev/mapper/nicvg-niclv' is on the VG above.
 
how can finish it?
 
any suggestion is regarded!

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