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Jump to navigationJump to search→Convert Software RAID1 to RAID5
{{Note box|msg=these instructions are only applicable if you have SME8 and a RAID1 system with 2 hd in sync; new drive(s) must be of the same size or larger as the current drive(s)}}
{{Note box|msg=these instructions are only applicable if you have SME8 and a RAID1 system with 2 hd in sync; new drive(s) must be of the same size or larger as the current drive(s)}}
{{Warning box|msg=Please make a full backup before proceeding}}
{{Warning box|msg=Please make a full backup before proceeding}}
{{Warning box|msg=Newer versions of mdadm use the v1.x superblocks stored at the beginning of the block device, which could overwrite the filesystem metadata. You’ll need to be starting with a v0.9 metadata device for the above instructions to work (which was the default for years).First, check the existing superblock version with:
mdadm –detail /dev/md0
Then, when re-creating the RAID 5 array, make sure you add the –metadata=0.9 tag so the superblock is recreated in the right place.
Unfortunately, v1.0 give a new size for the md device (smaller than the original array), v1.1 and v1.2 corrupts the filesystem outright, so best to avoid these cases entirely. Creating a new array with v1.x superblocks when the original was v0.9 is likewise outright destructive.}}
<ol></li><li>Login as root
<ol></li><li>Login as root
</li><li>Move to /boot (we must create a new initrd image to load raid5 driver).
</li><li>Move to /boot (we must create a new initrd image to load raid5 driver).
