From ae3bbe38beeac5f18ce6d6725f091de4d49ba963 Mon Sep 17 00:00:00 2001 From: makefu Date: Fri, 14 Feb 2014 16:25:58 +0100 Subject: add recover-softraidlvm --- content/posts/recover-softraidlvm.md | 100 ---------------------------------- content/posts/recover-softraidlvm.rst | 62 +++++++++++++++++++++ 2 files changed, 62 insertions(+), 100 deletions(-) delete mode 100644 content/posts/recover-softraidlvm.md create mode 100644 content/posts/recover-softraidlvm.rst diff --git a/content/posts/recover-softraidlvm.md b/content/posts/recover-softraidlvm.md deleted file mode 100644 index 9efdbab..0000000 --- a/content/posts/recover-softraidlvm.md +++ /dev/null @@ -1,100 +0,0 @@ -Title: Recover Softraid/LVM -Date: 2012-02-06 10:24 -Slug: recover-softraidlvm - -MD Array fails to assemble --------------------------- - -

- -

-

-
-Find the Problem - -
-
- -+--------------------------------------+--------------------------------------+ -| ``` {.line-numbers} | #?/bin/shcat /proc/mdstatmdadm - | -| 12345 | D --scanmdadm -E --scanmdadm -E /dev | -| ``` | /sd[abcdef]1 | -+--------------------------------------+--------------------------------------+ - -
- -
-

- -

-

-
-Try to assemble manually - -
-
- -+--------------------------------------+--------------------------------------+ -| ``` {.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 | -+--------------------------------------+--------------------------------------+ - -
- -
-

- -

-

-
-recover a failed device in the array - -
-
- -+--------------------------------------+--------------------------------------+ -| ``` {.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!" | -+--------------------------------------+--------------------------------------+ - -
- -
-

- -Recover LVM after doing something stupid ----------------------------------------- - -

- -

-

-
-Restore VolGroup Partitioning - -
-
- -+--------------------------------------+--------------------------------------+ -| ``` {.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 | -+--------------------------------------+--------------------------------------+ - -
- -
-

- diff --git a/content/posts/recover-softraidlvm.rst b/content/posts/recover-softraidlvm.rst new file mode 100644 index 0000000..efc070d --- /dev/null +++ b/content/posts/recover-softraidlvm.rst @@ -0,0 +1,62 @@ +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 -- cgit v1.2.3