[Slackdocs] RAID howto

Niki Kovacs info at microlinux.fr
Sun Oct 14 16:17:26 CEST 2012

Le 14/10/2012 13:45, Paul Chavent a écrit :
> I did the same, but as i explained it before, if i do :
> mdadm --create /dev/md2 --level 1 --raid-devices 2 /dev/sda2 /dev/sdb2
> I can use the device during the installation, but after reboot, the
> /dev/md2 is NOT mounted.
> That because the "not metadata=0.90" arrays are decreasing numbered form
> /dev/md127 ... or named as /dev/md/name
> That why i struggle with raid since my first post. I'm looking or the
> right way to do.

I'm running a RAID 1 server with two disks and a RAID 5 server with four 
disks here.

Trying to recall how I figured it out.

1) I used the --metadata=0.90 option for every array: md1, md2 and md3.

2) The RAID 5 server was a bit of a struggle. I had a full afternoon of 
failed attempts, but in the end, I simply tried and let the 
synchronization finish *before* the first reboot. This proved to work well.

3) On startup, I do see something like this in the early boot messages:

/dev/md125 stopped
/dev/md126 stopped
/dev/md127 stopped

But immediately after this come the following lines:

/dev/md1 started
/dev/md2 started
/dev/md3 started

I don't know if my way of setting up a RAID array is orthodox or not. 
But hey, it works.


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