How can I change one PV in one leg of an LVM mirrored LV to a PV in another leg on Red Hat Enterprise Linux
Issue
- We have LV mirror on top of PVs coming from two storage units.
- When one storage fails we expect that mirror will not fail and one copy of it will be running.
- We want to remove one of the storage units and keep the LV running (without mirror)
Environment
- Red Hat Enterprise Linux (RHEL) 5, 6, 7
-
LVM mirrored logical Volume (LV) with its data (PV's) on top of 2 physical storage units
-
Storage layout:
- Storage A -
/dev/mapper/storage_a_1,/dev/mapper/storage_a_2 - Storage B -
/dev/mapper/storage_b_1,/dev/mapper/storage_b_2
- Storage A -
# lvs -a -o +devices
LV VG Attr LSize Origin Snap% Move Log Copy% Convert Devices
lv_mirror vg_test Mwi-ao 1.0G 100.00 lv_mirror_mimage_0(0),lv_mirror_mimage_1(0)
[lv_mirror_mimage_0] vg_test iwi-ao 1.0G /dev/mapper/storage_a_1(0)
[lv_mirror_mimage_0] vg_test iwi-ao 1.0G /dev/mapper/storage_b_1(0)
[lv_mirror_mimage_1] vg_test iwi-ao 1.0G /dev/mapper/storage_a_2(0)
[lv_mirror_mimage_1] vg_test iwi-ao 1.0G /dev/mapper/storage_b_2(0)
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