Re: raid1 mysteriously switching to read-only

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On Saturday December 10, yang.geum.seok@xxxxxxxxx wrote:
> I am sorry because there is no information very.
> 
> I currently ext3 file system.
> 
> I composed RAID-1(/dev/md0)  disk array by order such as lower part.
> 
> mkfs.ext3 -j /dev/sda1
> mkfs.ext3 -j /dev/sda1
> mdadm -Cv /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

This is not the way raid1 works.
The raid1 array /dev/md0 will be slightly smaller than either sda1 or
sdb1.  So the filesystem will 'think' it is the size of sda1, will
eventually discover it is smaller, and will fail.
You should:
  mdadm -Cv /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1
  mkfs.ext3 -j /dev/md0
  mount /dev/md0 /data/disk1

and THEN use the filesystem.
NeilBrown
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