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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>
|
