RAID Creation

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MD devices are created using the Create mode of mdadm.

As of lvm2 2.02.87 and linux 2.6.32, LVM can be used to create MD-RAID volumes (lvcreate --type=raidN --stripes=numstripes). This offers a strong guarantee that the component devices won't be exposed.

With mdadm, you specify the raid device to create, the raid mode (raid0, raid1, raid10, raid5, raid6 etc) and the component devices.

For example:

mdadm --create --bitmap=internal --metadata=1.2 --level=1 --raid-devices=2 /dev/md1 /dev/sda /dev/sdb

You can also configure many aspects of your array:

One question that frequently comes up with linux raid is:

“Why does linux raid do 'resync' when I create a clean array? Can I skip that?”

The answer is usually "NO". For more details see Initial Array Creation

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