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Old 01-19-2012, 10:48 PM   #1
Registered: Oct 2010
Location: Cleveland
Distribution: Slackware, Fedora, RHEL (4,5), LFS 6.7, CentOS
Posts: 258

Rep: Reputation: 29
mdadm assemble on boot issue

Hey guys,

I have a working Raid 5 array that was on EL6, I removed EL6 to put FC15 on to get better support with Handbrake. After the install of FC16 Linux seems to be having issues with auto assemble on boot...

if I do:
mdadm --stop /dev/mdX
mdadm --assemble /dev/mdX /dev/sd[bcde]1

It will assemble the device perfectly and I can then mount it...

If I let the boot auto assemble, I will get a device /dev/md0 but 2 drives are missing from it.... I have edited /etc/mdadm.conf with

mdadm --assemble --scan >> /etc/mdadm.conf
shows the proper UUID and drive information looks correct...

I have also even went the path of recreate the array..

Same issue...

Like I said if I stop the one that loads from boot, and then assemble it myself it will work flawlessly... I am just at a loss on what next to do.

Any suggestions?
Old 01-20-2012, 10:35 AM   #2
Registered: Jun 2007
Distribution: Fedora, RHEL, Centos
Posts: 294

Rep: Reputation: 54
i'm just spit-balling here, but after you remake your /etc/mdadm.conf do you then need to remake your initrd - mkinitrd?
I'm not sure, but does it import /etc/mdadm.conf into your init image?
Old 01-20-2012, 01:10 PM   #3
Registered: Oct 2010
Location: Cleveland
Distribution: Slackware, Fedora, RHEL (4,5), LFS 6.7, CentOS
Posts: 258

Original Poster
Rep: Reputation: 29
You know, I did look in the init image and it did not have the current settings in there... in fact it had nothing... When I get sometime today I will look into remaking init.
Old 06-06-2013, 08:23 AM   #4
Registered: Feb 2004
Location: Philadelphia, PA
Distribution: FC3 i386 & PPC
Posts: 36

Rep: Reputation: 15
A little late, but at the time this was written, I believe there was a bug in mdadm. I ended up corrupting a 7TB array trying to get it to work in Fedora 15 in December of 2011 before I realized I had missed a line in the logs that appeared to point to a known bug. This appeared to be in the mdadm version on the disk and in the repository at that time.

TL;DR stick with a server distro for handling server like functions, run desktop linux in a VM.


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