add recover-softraidlvm
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makefu
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Title: Recover Softraid/LVM
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Date: 2012-02-06 10:24
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Slug: recover-softraidlvm
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MD Array fails to assemble
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--------------------------
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</p>
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<p>
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<figure class="code">
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<figcaption>
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<span>Find the Problem</span>
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</figcaption>
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<div class="highlight">
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+--------------------------------------+--------------------------------------+
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| ``` {.line-numbers} | #?/bin/shcat /proc/mdstatmdadm - |
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| 12345 | D --scanmdadm -E --scanmdadm -E /dev |
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| ``` | /sd[abcdef]1 |
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+--------------------------------------+--------------------------------------+
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</div>
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</figure>
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</p>
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<p>
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<figure class="code">
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<figcaption>
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<span>Try to assemble manually</span>
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</figcaption>
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<div class="highlight">
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+--------------------------------------+--------------------------------------+
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| ``` {.line-numbers} | #?/bin/shmdadm --stop /dev/md{0, |
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| 123 | 127}mdadm --assemble /dev/md0 /dev/s |
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| ``` | d{a,b,c,d,e,f}1 --force |
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+--------------------------------------+--------------------------------------+
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</div>
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</figure>
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</p>
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<p>
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<figure class="code">
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<figcaption>
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<span>recover a failed device in the array</span>
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</figcaption>
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<div class="highlight">
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+--------------------------------------+--------------------------------------+
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| ``` {.line-numbers} | #?/bin/shmdadm /dev/md0 --re-add |
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| 123456 | /dev/sdx1 # will likely failmdadm - |
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| ``` | -zero-superblock /dev/sdx1 # reap th |
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| | e deviceecho 200000 > /proc/sys/dev/ |
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| | raid/speed_limit_min # speed up reco |
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| | verymdadm /dev/md0 --add /dev/sde1sl |
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| | eep 56000 && echo "FINISHED!" |
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+--------------------------------------+--------------------------------------+
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</div>
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</figure>
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</p>
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Recover LVM after doing something stupid
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----------------------------------------
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</p>
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<p>
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<figure class="code">
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<figcaption>
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<span>Restore VolGroup Partitioning</span>
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</figcaption>
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<div class="highlight">
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+--------------------------------------+--------------------------------------+
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| ``` {.line-numbers} | #?/bin/sh# imagine you did somet |
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| 123456789 | hing like 'vgremove vg'vgdisplay -v |
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| ``` | # > logical volume: empty :(# lvm st |
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| | ores backup of partitioning, yayvgcf |
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| | grestore -f /etc/lvm/archive/vg_0001 |
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| | 8-2146062166.vg -v vgvgchange -ayvgd |
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| | isplay -v # > logical volume: files1 |
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| | e2fsck /dev/vg/files1mount /dev/vg/ |
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| | files1 |
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+--------------------------------------+--------------------------------------+
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</div>
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</figure>
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</p>
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62
content/posts/recover-softraidlvm.rst
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62
content/posts/recover-softraidlvm.rst
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@ -0,0 +1,62 @@
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Recover Softraid/LVM
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####################
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Date: 2012-02-06 10:24
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:tags: mdadm, softraid, lvm
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MD Array fails to assemble
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==========================
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Find the Problem
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----------------
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.. code-block:: bash
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#?/bin/sh
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cat /proc/mdstat
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mdadm -D --scan
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mdadm -E --scan
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mdadm -E /dev/sd[abcdef]1
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Trying to assemble manually
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---------------------------
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.. code-block:: bash
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#?/bin/sh
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mdadm --stop /dev/md{0,127}
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mdadm --assemble /dev/md0 /dev/sd{a,b,c,d,e,f}1 --force
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recover a failed device in the array
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------------------------------------
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.. code-block:: bash
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#?/bin/sh
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mdadm /dev/md0 --re-add /dev/sdx1 # will likely fail
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mdadm --zero-superblock /dev/sdx1 # reap the device
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echo 200000 > /proc/sys/dev/raid/speed_limit_min # speed up recovery
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mdadm /dev/md0 --add /dev/sde1
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sleep 56000 && echo "FINISHED!"
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Recover LVM after doing something stupid
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========================================
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Restore VolGroup Partitioning
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-----------------------------
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.. code-block:: bash
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#?/bin/sh
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# imagine you did something like 'vgremove vg'
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vgdisplay -v # > logical volume: empty :(
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# lvm stores backup of partitioning, yay
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vgcfgrestore -f /etc/lvm/archive/vg_00018-2146062166.vg -v vg
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vgchange -ay
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vgdisplay -v # > logical volume: files1
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e2fsck /dev/vg/files1
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mount /dev/vg/files1
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