F16 occasionally breaks RAID1 (md) on boot

[Reindl Harald]

"wonderful" news shortly before a new machine
arrives which will NATURLY use RAID and was planned
as first fedora16 setup

are we getting only broken pieces now?

until and including F14 Fedora was a rock stable
distribution, but currently all feels like "let's
see what they have broken now"

Am 16.02.2012 02:49, schrieb Andreas M. Kirchwitz:
> 	Hello users of Linux software RAID!
> 
> I have two identical harddisks, and on a freshly installed Fedora 16
> all my filesystems (/boot, /, /home, /usr/local, /opt, swap) are set up
> as software RAID1 (md).
> 
> Occasionally (about every second boot), Fedora 16 silently removes
> one of the mirrors from the RAID1 devices. Sometimes this happens
> for just one device, sometimes for up to three. So far, it never
> happened to "/boot", "/" and swap but only to "/home", "/usr/local"
> and "/opt".
> 
> The harddisks are fine. There are no errors in /var/log/messages.
> SMART is happy. Partition tables, partition types etc. are identical
> for both disks. As said, it doesn't happen always, so hardware and
> configuration should be okay in general. There must be a bug in the
> kernel or in the startup scripts that assemble the RAID devices
> during the boot process.
> 
> If I do "mdadm --add /dev/mdX /dev/sdaX" everything is fine after
> a couple of seconds. All the UUIDs are fine. It's all there and
> as it should be. There's no reason what goes wrong during startup.
> 
> So far, it never happened to the second harddisk (/dev/sdb),
> only the primary harddisk (/dev/sda) was affected.
> 
> With Fedora 14 (and before), I never had such issues.
> 
> Basically the same problem has been reported by Sam Varshavchik
> in <cone.1323864504.969555.2535.1000 at monster.email-scan.com>
> but there wasn't a final solution.
> 
> Fact is, that the failing RAID devices are not mentioned in the
> kernel options in /boot/grub2/grub.cfg. I've checked with my old
> F14 config (GRUB1), but it was the very same there (only /boot, /
> and swap were specified, but no other RAID devices). And F14 worked
> perfectly fine. And it works with F16 also, but just not always.
> 
> Software RAID is a mess in Fedora 16. First that issue with /boot
> on RAID-1, now the startup process fails to assemble RAID devices.
> 
> 	Greetings, Andreas

-- 

Mit besten Grüßen, Reindl Harald
the lounge interactive design GmbH
A-1060 Vienna, Hofmühlgasse 17
CTO / software-development / cms-solutions
p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40
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