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I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space.

Then I went into system->administration->disk utility. In there I went to file->create->RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array.

After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested."

What do I do now? As far as I can tell, the partitions are identical.

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  • What made you decide to put swap space on your RAID0 disks? This sounds counter-intuitive if you want good stripe performance... and assumes you actually need swap in the first place which many systems today do NOT.
    – hotei
    Commented Aug 23, 2010 at 1:31

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I found the solution. Apparently the gui does something wrong when it creates the raid array. The way I did it was to format the partitions in gparted. Then I went into the terminal and typed the following:

mdadm --create /dev/md0 --chunk=4 --level=0 --raid-devices=2 /dev/sda1 /dev/sdb1

I used this as a guide: http://ubuntuforums.org/showthread.php?t=408461

When I went back to the gui it didn't have the warning message anymore.

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I believe it's saying that the partition is not aligned on a cylinder boundary. fdisk -l should show it, but I'm not sure.

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