Some time back I started setting up a couple of vdr computers with raid.
The one with 3 500gb drives, I setup 2 raid 1 partitions with 1 spare fo
boot and swap and used the rest of the 3 drives for a raid5 array. I had
problems getting it to boot, and it was advised to change the raid 1
arrays to 3 mirror which I did. Bu I got busy with other things and
never tried to switch it to boot from the arrays. Since then I aquired a
4th drive same size and model. I want to change md0/1 back to 2 drive
mirrors and change md2 from raid5 to raid1 freeing up a drive which I
then want use to with the new drive to create another raid1 array.
Before I can install the new drive, I need to get it booting from md0 so
I can remove the old ide drive.
I figure I need to shrink md0 and md1 and then fail the 3rd drive in
each of those 2 arrays before changing them to 2 drive arrays? I find
lots of stuff about adding drives, but not much about removing the
drives or how to change them back to 2 drive arrays.
Once md0 and md1 are back to 2 drives and it's booting, then I'll
install and format the new drive and copy the contents of md2 over. Then
I need to remake md2 as a 2 drive raid1. Then copy the data back and
i'll have 2 drives to make md3.
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