Why does my RAID configuration with mdadm fail on reboots?

Posted by Andy B on Ask Ubuntu See other posts from Ask Ubuntu or by Andy B
Published on 2011-11-15T21:15:17Z Indexed on 2011/11/16 2:08 UTC
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Filed under:

11.10

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server

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mdadm

I have been running Ubuntu server on my machine for 2 years and it has worked ok.
I would like to speed it up by raiding a few drives. The machine is used to host my Mysql databases internally.

using MDADM raid..

I have tried 2 schemes so far with the 3 drives.
2 partitions on each drive 1 for the swap 1 for the O/S both of them turned into drives raid level 5

3 partitions on each drive 1 for the boot 1 for the swap and 1 for the root. The boot I set to raid level1 and the swap and root raid drives were set to level5

Both setup worked fine for about a week, then on a reboot things fall apart.

by fall apart I mean I end up with a bunch of hard drive errors on the screen and then get a grub prompt.

Why do they fail on reboots?

I am eager to understand what I am doing wrong

thanks!

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