mdadm: Insufficient head-space for reshape on /dev/sda2

* mdadm: Insufficient head-space for reshape on /dev/sda2
@ 2020-08-04  8:25 H. Morala (HyD)
  0 siblings, 0 replies; only message in thread
From: H. Morala (HyD) @ 2020-08-04  8:25 UTC (permalink / raw)
  To: linux-rdma

Hello,

We tried to do:

 	mdadm --grow /dev/md126 --raid-devices=4 

and we get:

	mdadm: Insufficient head-space for reshape on /dev/sda2

This is the present  configuration:

# mdadm --misc --detail /dev/md126
/dev/md126:
           Version : 1.0
     Creation Time : Fri May 27 12:40:54 2016
        Raid Level : raid10
        Array Size : 512960 (500.94 MiB 525.27 MB)
     Used Dev Size : 512960 (500.94 MiB 525.27 MB)
      Raid Devices : 2
     Total Devices : 4
       Persistence : Superblock is persistent

       Update Time : Mon Aug  3 17:33:04 2020
             State : clean 
    Active Devices : 2
   Working Devices : 4
    Failed Devices : 0
     Spare Devices : 2

            Layout : near=2
        Chunk Size : 64K

Consistency Policy : resync

              Name : boot
              UUID : 5fc23b3c:93ecd502:0fbf3b82:adc7ad2d
            Events : 746

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync set-A   /dev/sda2
       4       8       50        1      active sync set-B   /dev/sdd2

       2       8       18        -      spare   /dev/sdb2
       3       8       34        -      spare   /dev/sdc2

# cat /etc/mdadm.conf 
ARRAY /dev/md/boot_0 metadata=1.0 spares=2 name=boot UUID=5fc23b3c:93ecd502:0fbf3b82:adc7ad2d

# cat /proc/mdstat 
Personalities : [raid1] [raid10] [raid0] 
md126 : active raid10 sdd2[4] sdc2[3](S) sdb2[2](S) sda2[0]
      512960 blocks super 1.0 2 near-copies [2/2] [UU]

# fdisk /dev/sda

The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Orden (m para obtener ayuda): p

Disk /dev/sda: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Identificador del disco: 0x0005ff1f

Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/sda1            2048     8265727     4131840   8e  Linux LVM
/dev/sda2   *     8265728     9291775      513024   fd  Linux raid autodetect
/dev/sda3         9291776   974243839   482476032   fd  Linux raid autodetect

# parted /dev/sda
GNU Parted 3.1
Usando /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print free
Model: ATA Crucial_CT500MX2 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Numero  Inicio  Fin     Tamaño  Typo     Sistema de ficheros  Banderas
        32,3kB  1049kB  1016kB           Free Space
 1      1049kB  4232MB  4231MB  primary                       lvm
 2      4232MB  4757MB  525MB   primary  xfs                  arranque, raid
 3      4757MB  499GB   494GB   primary                       raid
        499GB   500GB   1295MB           Free Space

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