John Thanks for the suggestion but that's still 'trying' things rather then an analytical approach. I also do not want to reboot this machine until I absolutely have to incase I need to capture any data needed to identify and thereby resolve the problem. Given I'm not getting much joy here I think I'll have to post a bug tomorrow and see where that goes. Thanks again. On 3 March 2016 at 20:47, John Stoffel <john@xxxxxxxxxxx> wrote: > > Have you tried pulling down the latest version of mdadm from Neil's > site with: > > git clone git://neil.brown.name/mdadm/ mdadm > cd mdadm > ./configure > make > > and seeing if that custom build does the trick for you? I know he's > done some newer patches which might help in this case. > > > Another> I'd read that a couple of days back and while it's an interesting idea > Another> I don't believe it will address my specific issue of the array not > Another> allowing re-assembly (even with force and read only flags set) as > Another> mdadm reports the 'need backup file for reshape, sorry' error no > Another> matter what I've tried. > > Another> Even trying the above flags with invalid-backup does not work so I > Another> need someone to have a eureka moment and say "....it's this....". > > Another> I believe that mdadm 3.3 incorporated the recover during reshape > Another> functionality, however I've read elsewhere it only applies to > Another> expansion into a new drive...I was going RAID6 to RAID5 (even though > Another> it never really got started) and the backup file looks like 20mb of > Another> EOLs. > > Another> So at he moment I'm pretty much stuck unless someone can tell me how > Another> to clear down the reshape flag, even in read only mode so I can copy > Another> the data off. > > > Another> On 3 March 2016 at 17:48, Sarah Newman <srn@xxxxxxxxx> wrote: >>> On 03/03/2016 06:07 AM, Another Sillyname wrote: >>>> Plenty of hits....but no clear fixes and as I said I'm not willing to >>>> 'try' things from google hits until someone with better insight can >>>> give me a view. >>>> >>>> Trying things is fine in many instances, but not with a 20+TB data set >>>> as I'm sure you can understand. >>>> >>> >>> I have not tried this personally, but it may be of interest: >>> https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID#Making_the_harddisks_read-only_using_an_overlay_file I found this explanation >>> of the dmsetup commands to be more easy to follow: http://www.flaterco.com/kb/sandbox.html >>> > Another> -- > Another> To unsubscribe from this list: send the line "unsubscribe linux-raid" in > Another> the body of a message to majordomo@xxxxxxxxxxxxxxx > Another> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
