Re: Help recovering an interrupted raid0 reshape

[NeilBrown <neilb@suse.de>]

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On Mon, 6 Apr 2015 22:14:56 -0700 "Jonathan Harker (Jesusaurus)"
<jesusaurus@gentlydownthe.net> wrote:

> On Mon, Apr 6, 2015 at 6:50 PM, NeilBrown <neilb@suse.de> wrote:
> > On Tue, 7 Apr 2015 09:46:08 +1000 NeilBrown <neilb@suse.de> wrote:
> >
> >> On Fri, 3 Apr 2015 19:22:15 -0700 "Jonathan Harker (Jesusaurus)"
> >> <jesusaurus@gentlydownthe.net> wrote:
> >>
> >> >
> >> > Third, is it possible to resume the reshape? If not, can it be reverted?
> >> >
> >>
> >> I'll have to get back to you on that.  Hopefully you can be patient a little
> >> longer.
> >>
> >> NeilBrown
> >>
> 
> Thanks for taking the time to look into this. I've managed to be
> patient with the problem for about a week now (I was cautiously poking
> and prodding the array for a few days before reaching out to this
> list) so I think I can manage a little more patience.
> 
> >>
> >
> > Hi again Jonathan,
> >  please report what version of mdadm and of Linux that you are running.
> 
> My mdadm version is "mdadm - v3.3.1 - 5th June 2014" and my linux
> version (according to `uname -r`) is 3.16.2-3.
> 
> >
> > Also is there any chance that you tried
> >    mdadm --assemble .... --update=revert-reshape
> > ??
> > And if you did, why didn't you say so :-)
> 
> During those first couple days I tried a couple assemble and
> incremental commands to try to get the reshape to restart, though I
> don't remember exactly what they were. It's possible I tried something
> as scary and irreversible as --update=revert-reshape in some desperate
> haze, so let's assume I did, but I was trying hard to avoid any advice
> that included --force in the command.

Try:
  mdadm -S /dev/md124
  mdadm -A /dev/md124 --update=revert-reshape /dev/md/alpha /dev/md/beta
  mdadm -S /dev/md124
  mdadm -A /dev/md124 -vvv /dev/md/alpha /dev/md/beta /dev/md/gamma

What does that report?

NeilBrown


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