Re: dead RAID6 array on CentOS6.6 / kernel 3.19

[NeilBrown <neilb@suse.de>]

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On Tue, 10 Feb 2015 22:08:20 -0500 Phil Turmel <philip@turmel.org> wrote:

> Hi Adam,
> 
> { Dropped members-only lists from CC }
> 
> On 02/10/2015 09:53 PM, Adam Thompson wrote:
> 
> >> [root@muug ~]# mdadm --verbose --misc --run --readonly /dev/md127
> >> mdadm: /dev/md127 does not appear to be active.

Supporting this sort of usage seemed like a good idea long long ago, but 
it doesn't turn out to be really useful, so I haven't maintained it at all.

> > 
> > 
> > Also, kernel 3.19, which I mentioned we're running, pretty much *is* my
> > definition of an up-to-date kernel... how much newer do you want me to
> > try, and where would you recommend I find such a thing in a bootable image?
> 
> You're right, 3.19 should be fine.  I'm stumped.  Looks like a bug.
> Adding Neil ....

I think it is an mdadm bug.  I don't see a mention of mdadm version number
(but I didn't look very hard).
If you are using 3.3, update to at least 3.3.1

(just
  cd /tmp
  git clone git://neil.brown.name/mdadm
  cd mdadm
  make
  ./mdadm --assemble --force /dev/md127 .....
)

NeilBrown

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