From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phil Turmel <philip@turmel.org>
Subject: Re: hung grow
Date: Sat, 7 Oct 2017 17:29:22 -0400
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On 10/07/2017 04:45 PM, Curt wrote:
> Here's the output of -E for sdf1 and one other, in case it's needed.
> As I understand it the UUID is what has to do with the superblock, but
> UUID's match between them.
> 
> mdadm -E /dev/sdf1
> /dev/sdf1:
>           Magic : a92b4efc
>         Version : 0.90.00
>            UUID : 714a612d:9bd35197:36c91ae3:c168144d
>   Creation Time : Fri Jun 15 15:52:05 2012
>      Raid Level : raid6
>   Used Dev Size : 1953503872 (1863.01 GiB 2000.39 GB)
>      Array Size : 9767519360 (9315.03 GiB 10001.94 GB)
>    Raid Devices : 7
>   Total Devices : 7
> Preferred Minor : 127
> 
>     Update Time : Sat Sep  2 01:00:37 2017
>           State : active
>  Active Devices : 6
> Working Devices : 6
>  Failed Devices : 1
>   Spare Devices : 0
>        Checksum : cd217ebc - correct
>          Events : 11559404
> 
>          Layout : left-symmetric
>      Chunk Size : 64K
> 
>       Number   Major   Minor   RaidDevice State
> this     5       8       65        5      active sync   /dev/sde1
> 
>    0     0       8       81        0      active sync   /dev/sdf1
>    1     1       8       33        1      active sync   /dev/sdc1
>    2     2       8       17        2      active sync
>    3     3      65      129        3      active sync   /dev/sdy1
>    4     4       8       49        4      active sync   /dev/sdd1
>    5     5       8       65        5      active sync   /dev/sde1
>    6     6       0        0        6      faulty removed
> 
> *****************************
> mdadm -E /dev/sda1
> /dev/sda1:
>           Magic : a92b4efc
>         Version : 0.91.00
>            UUID : 714a612d:9bd35197:36c91ae3:c168144d
>   Creation Time : Fri Jun 15 15:52:05 2012
>      Raid Level : raid6
>   Used Dev Size : 1953503872 (1863.01 GiB 2000.39 GB)
>      Array Size : 11721023232 (11178.04 GiB 12002.33 GB)
>    Raid Devices : 8
>   Total Devices : 6
> Preferred Minor : 127
> 
>   Reshape pos'n : 3799296 (3.62 GiB 3.89 GB)
>   Delta Devices : 1 (7->8)
> 
>     Update Time : Wed Oct  4 12:49:57 2017
>           State : clean
>  Active Devices : 6
> Working Devices : 6
>  Failed Devices : 2
>   Spare Devices : 0
>        Checksum : ce71a9cb - correct
>          Events : 11559681
> 
>          Layout : left-symmetric
>      Chunk Size : 64K
> 
>       Number   Major   Minor   RaidDevice State
> this     3       8        1        3      active sync   /dev/sda1
> 
>    0     0       8       97        0      active sync   /dev/sdg1
>    1     1       8       49        1      active sync   /dev/sdd1
>    2     2       8       33        2      active sync   /dev/sdc1
>    3     3       8        1        3      active sync   /dev/sda1
>    4     4       8       65        4      active sync   /dev/sde1
>    5     5       0        0        5      faulty removed
>    6     6       8       16        6      active   /dev/sdb
>    7     7       0        0        7      faulty removed
> 

Hmm.  Please run the assemble again, with the --verbose option, and
paste all the output here so we can see what's happening.

Also grab the corresponding tail of dmesg (however many lines cover the
assembly attempt).

Phil