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Recover Softraid/LVM
####################
Date: 2012-02-06 10:24
:tags: mdadm, softraid, lvm
MD Array fails to assemble
==========================
Find the Problem
----------------
.. code-block:: bash
#?/bin/sh
cat /proc/mdstat
mdadm -D --scan
mdadm -E --scan
mdadm -E /dev/sd[abcdef]1
Trying to assemble manually
---------------------------
.. code-block:: bash
#?/bin/sh
mdadm --stop /dev/md{0,127}
mdadm --assemble /dev/md0 /dev/sd{a,b,c,d,e,f}1 --force
recover a failed device in the array
------------------------------------
.. code-block:: bash
#?/bin/sh
mdadm /dev/md0 --re-add /dev/sdx1 # will likely fail
mdadm --zero-superblock /dev/sdx1 # reap the device
echo 200000 > /proc/sys/dev/raid/speed_limit_min # speed up recovery
mdadm /dev/md0 --add /dev/sde1
sleep 56000 && echo "FINISHED!"
Recover LVM after doing something stupid
========================================
Restore VolGroup Partitioning
-----------------------------
.. code-block:: bash
#?/bin/sh
# imagine you did something like 'vgremove vg'
vgdisplay -v # > logical volume: empty :(
# lvm stores backup of partitioning, yay
vgcfgrestore -f /etc/lvm/archive/vg_00018-2146062166.vg -v vg
vgchange -ay
vgdisplay -v # > logical volume: files1
e2fsck /dev/vg/files1
mount /dev/vg/files1
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