Difference between revisions of "Mdadm"
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| + | mdadm is a tool to create and manage software RAID. It allows you to | ||
| + | * '''create''' a (new) software raid array. Think of two USB hard drives that you just bought and that you want to use in a RAID 1 configuration. | ||
| + | * '''assemble''' an (existing) array. Think of two USB hard drives that you have in your shelve and that you have already made to a RAID array using the ''create'' command. When you re-attach them to your computer, you need to tell the computer how the disks belong together (RAID 0 or RAID 1 for example). That is what the assemble command is for. | ||
| + | |||
| + | = Create = | ||
mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdh /dev/sdi | mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdh /dev/sdi | ||
| + | |||
| + | = Assemble = | ||
| + | # mdadm --assemble --scan | ||
| + | mdadm: /dev/md/0 has been started with 2 drives. | ||
| + | |||
| + | = Store configuration = | ||
| + | You can store your mdadm configuration like this: | ||
| + | mdadm --detail --scan >/etc/mdadm.conf | ||
| + | |||
| + | = Monitor = | ||
| + | Monitor your raid's status with the command | ||
| + | cat /proc/mdstat | ||
= See also = | = See also = | ||
| − | * [http:// | + | * [http://linux.die.net/man/8/mdadm mdadm's man page] |
| + | * http://www.ducea.com/2009/03/08/mdadm-cheat-sheet/ | ||
{{stub}} | {{stub}} | ||
Latest revision as of 09:42, 22 April 2014
mdadm is a tool to create and manage software RAID. It allows you to
- create a (new) software raid array. Think of two USB hard drives that you just bought and that you want to use in a RAID 1 configuration.
- assemble an (existing) array. Think of two USB hard drives that you have in your shelve and that you have already made to a RAID array using the create command. When you re-attach them to your computer, you need to tell the computer how the disks belong together (RAID 0 or RAID 1 for example). That is what the assemble command is for.
Create
mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdh /dev/sdi
Assemble
# mdadm --assemble --scan mdadm: /dev/md/0 has been started with 2 drives.
Store configuration
You can store your mdadm configuration like this:
mdadm --detail --scan >/etc/mdadm.conf
Monitor
Monitor your raid's status with the command
cat /proc/mdstat
See also
This article is a stub and needs improvement. You can help here :)
