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Re: [linux-lvm] How to re-stripe a LV after pvmove?



Heinz Mauelshagen wrote:
On Thu, Mar 29, 2007 at 01:42:47PM +0200, Olle Liljenzin wrote:
Hello,

How can I rearrange a striped volume after pvmove has been run, so that I get back the original structure with the stripes equally distributed on PVs?

I need to presume, that IO to the striped LV was going on during pvmove.
Hence restoring the old mapping won't help and will lead to data corruption.

pvmove back using the destination options of the command.

Maybe an example is helpful. After the commands below I have two stripes on sdb2 and one on sdb3. How do I move one of the stripes from sdb2 to sdb4?

pvcreate /dev/sdb{1,2,3}
vgcreate vg /dev/sdb{1,2,3}
lvcreate -i 3 -L100M -n lv /dev/vg
vgreduce /dev/vg /dev/sdb1
pvremove /dev/sdb1
pvcreate /dev/sdb4
vgextend /dev/vg /dev/sdb4
lvdisplay -m /dev/vg/lv

--- Logical volume ---
 LV Name                /dev/vg/lv
 VG Name                vg
 LV UUID                NVBrvT-5fZe-0qKA-LCYA-Z9au-X84A-fXYkx3
 LV Write Access        read/write
 LV Status              available
 # open                 0
 LV Size                108.00 MB
 Current LE             27
 Segments               1
 Allocation             inherit
 Read ahead sectors     0
 Block device           253:2
 --- Segments ---
 Logical extent 0 to 26:
   Type                striped
   Stripes             3
   Stripe size         64 KB
   Stripe 0:
     Physical volume   /dev/sdb2
     Physical extents  9 to 17
   Stripe 1:
     Physical volume   /dev/sdb2
     Physical extents  0 to 8
   Stripe 2:
     Physical volume   /dev/sdb3
     Physical extents  0 to 8


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