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I'm new to RAID. Creating a new RAID1 array from blank, newly-partitioned 100GB disks with

sudo mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/xvdf1 /dev/xvdg1

...looks to be taking about an hour to rebuild. My questions are:

  1. are there any shortcuts that can be taken on this initial "resync", since there's not (AFAIK) any data I need copied between the empty disks

  2. can I blithely format /dev/md0 and treat it like a normal disk while it's in the middle of its initial sync, as long as I'm okay with it being in a "degraded" state for a bit?

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up vote 3 down vote accepted
mdadm --create --assume-clean ...

See the mdadm manpage for drawbacks.

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I don't know about a shortcut, but you can start to use it immediately, with a reduced performance as only drawback.

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