mirror of https://github.com/cheat/cheat.git
59 lines
1.9 KiB
Plaintext
59 lines
1.9 KiB
Plaintext
# For the sake of briefness, we use Bash "group compound" stanza:
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# /dev/sd{a,b,...}1 => /dev/sda1 /dev/sdb1 ...
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# Along the following variables:
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# ${M} array identifier (/dev/md${M})
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# ${D} device identifier (/dev/sd${D})
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# ${P} partition identifier (/dev/sd${D}${P})
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# Create (initialize) a new array
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mdadm --create /dev/md${M} --level=raid5 --raid-devices=4 /dev/sd{a,b,c,d,e}${P} --spare-devices=/dev/sdf1
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# Manually assemble (activate) an existing array
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mdadm --assemble /dev/md${M} /dev/sd{a,b,c,d,e}${P}
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# Automatically assemble (activate) all existing arrays
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mdadm --assemble --scan
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# Stop an assembled (active) array
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mdadm --stop /dev/md${M}
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# See array configuration
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mdadm --query /dev/md${M}
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# See array component configuration (dump superblock content)
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mdadm --query --examine /dev/sd${D}${P}
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# See detailed array confiration/status
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mdadm --detail /dev/md${M}
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# Save existing arrays configuration
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# (MAY be required by initrd for successfull boot)
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mdadm --detail --scan > /etc/mdadm/mdadm.conf
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# Erase array component superblock
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# (MUST do before reusing a partition for other purposes)
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mdadm --zero-superblock /dev/sd${D}${P}
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# Manually mark a component as failed
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# (SHOULD when a device shows wear-and-tear signs, e.g. through SMART)
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mdadm --manage /dev/md${M} --fail /dev/sd${D}${P}
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# Remove a failed component
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# (SHOULD before preemptively replacing a device, after failing it)
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mdadm --manage /dev/md${M} --remove /dev/sd${D}${P}
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# Prepare (format) a new device to replace a failed one
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sfdisk -d /dev/sd${D,sane} | sfdisk /dev/sd${D,new}
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# Add new component to an existing array
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# (this will trigger the rebuild)
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mdadm --manage /dev/md${M} --add /dev/sd${D,new}${P}
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# See assembled (active) arrays status
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cat /proc/mdstat
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# Rename a device
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# (SHOULD after hostname change; eg. name="$(hostname -s)")
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mdadm --assemble /dev/md${M} /dev/sd{a,b,c,d,e}${P} --name="${name}:${M}" --update=name
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