[CentOS] *very* ugly mdadm issue [Solved, badly]
m.roth at 5-cent.us
m.roth at 5-cent.usThu Sep 4 20:48:49 UTC 2014
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Tom Bishop wrote: > On Thu, Sep 4, 2014 at 3:30 PM, <m.roth at 5-cent.us> wrote: >> >> Here's the answer: making a software RAID on a bare drive with no GPT >> works fine. If it has a GPT, and no partition, it fails on reboot, even >> with an /etc/mdadm.conf. >> >> I've proved this: >> first, I created the array on the bare drive, rebooted, and >> /dev/md0 was there; >> then, I used parted to create a gpt, then the array, reboot, no >> md0, even with mdadm --assemble, even with /etc/mdadm.conf. >> finally, I got rid of the disk label (parted to make an msdos >> label, the zeroing out the beginning of the disk), and again made >> the RAID on the bare drives, reboot, and md0 is there. >> >> So that's what killed me. Admins, take heed.... >> > > Thanks for the followup. > > :) Yup. My manager had asked me to figure it out, and as it just so happened our director wound up needing more space on another machine, that I could reboot as I will, I could do the testing. mark, watch out for the gotchas
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