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