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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