2020-04-28 17:29:52 +02:00
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---
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title: "mdadm"
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date: 2011-11-15
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2021-03-11 19:47:26 +01:00
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description: some mdadm command examples
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tags:
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- linux
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2021-03-12 18:12:41 +01:00
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- toolbox
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2020-04-28 17:29:52 +02:00
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---
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## Watch the array status
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{{< highlight sh >}}
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watch -d -n10 mdadm --detail /dev/md127
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{{< /highlight >}}
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## Recovery from livecd
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{{< highlight sh >}}
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mdadm --examine --scan >> /etc/mdadm.conf
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mdadm --assemble --scan /dev/md/root
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mount /dev/md127 /mnt # or vgscan...
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{{< /highlight >}}
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If auto detection does not work, you can still assemble an array manually :
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{{< highlight sh >}}
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mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1
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{{< /highlight >}}
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## Resync an array
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First rigorously check the output of `cat /proc/mdstat`
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{{< highlight sh >}}
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mdadm --manage --re-add /dev/md0 /dev/sdb1
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{{< /highlight >}}
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## Destroy an array
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{{< highlight sh >}}
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mdadm --stop /dev/md0
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mdadm --zero-superblock /dev/sda
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mdadm --zero-superblock /dev/sdb
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{{< /highlight >}}
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