黑裙 raid1 如何扩容

用的 vm 弄得虚拟机装的黑裙，当初装的时候，新建了两个虚拟硬盘 150G, 组了个 raid1, 但是现在发现磁盘有点不够，给两个硬盘都扩容到 500G , Nas 里看到的存储池两个硬盘确实是 500G 但是可用还是 150G，

用网上说的物理硬盘的形式，插拔形式同步替换了好像也不行。

# mdadm -D /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Thu Dec 20 10:40:21 2018
     Raid Level : raid1
     Array Size : 152464384 (145.40 GiB 156.12 GB)
  Used Dev Size : 152464384 (145.40 GiB 156.12 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Fri Oct 11 22:24:17 2019
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : Kerwin-NAS:2  (local to host Kerwin-NAS)
           UUID : b3222639:4a6f6d7f:9bcf4491:c47d736f
         Events : 4909

    Number   Major   Minor   RaidDevice State
       2       8       51        0      active sync   /dev/sdd3
       3       8       67        1      active sync   /dev/sde3


fdisk -l
Disk /dev/synoboot: 50 MiB, 52428800 bytes, 102400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B3CAAA25-3CA1-48FA-A5B6-105ADDE4793F

Device         Start    End Sectors Size Type
/dev/synoboot1  2048  32767   30720  15M EFI System
/dev/synoboot2 32768  94207   61440  30M Linux filesystem
/dev/synoboot3 94208 102366    8159   4M BIOS boot


Disk /dev/sdb: 10 GiB, 10737418240 bytes, 20971520 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xb5be3cf2

Device     Boot   Start     End Sectors  Size Id Type
/dev/sdb1          2048 4982527 4980480  2.4G fd Linux raid autodetect
/dev/sdb2       4982528 9176831 4194304    2G fd Linux raid autodetect


Disk /dev/sda: 500 GiB, 536870912000 bytes, 1048576000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x9978bd16

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sda1          2048   4982527   4980480   2.4G fd Linux raid autodetect
/dev/sda2       4982528   9176831   4194304     2G fd Linux raid autodetect
/dev/sda3       9437184 314367999 304930816 145.4G fd Linux raid autodetect


Disk /dev/sdc: 500 GiB, 536870912000 bytes, 1048576000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xd6ac5a88

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sdc1          2048   4982527   4980480   2.4G fd Linux raid autodetect
/dev/sdc2       4982528   9176831   4194304     2G fd Linux raid autodetect
/dev/sdc3       9437184 314367999 304930816 145.4G fd Linux raid autodetect


Disk /dev/sdd: 500 GiB, 536870912000 bytes, 1048576000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe7a70274

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sdd1          2048   4982527   4980480   2.4G fd Linux raid autodetect
/dev/sdd2       4982528   9176831   4194304     2G fd Linux raid autodetect
/dev/sdd3       9437184 314367999 304930816 145.4G fd Linux raid autodetect


Disk /dev/sde: 500 GiB, 536870912000 bytes, 1048576000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x96888e42

Device     Boot   Start       End   Sectors   Size Id Type
/dev/sde1          2048   4982527   4980480   2.4G fd Linux raid autodetect
/dev/sde2       4982528   9176831   4194304     2G fd Linux raid autodetect
/dev/sde3       9437184 314367999 304930816 145.4G fd Linux raid autodetect


Disk /dev/md0: 2.4 GiB, 2549940224 bytes, 4980352 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/md1: 2 GiB, 2147418112 bytes, 4194176 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/zram0: 1 GiB, 1086324736 bytes, 265216 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/zram1: 1 GiB, 1086324736 bytes, 265216 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/md2: 145.4 GiB, 156123529216 bytes, 304928768 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

网上说的比较多的是 grow 但是依旧是 150 G 而不是 500

# mdadm --grow --size=max /dev/md2
mdadm: component size of /dev/md2 unchanged at 152464384K

然后

# resize2fs  /dev/md2
resize2fs 1.42.6 (21-Sep-2012)
resize2fs: Device or resource busy while trying to open /dev/md2
Couldn't find valid filesystem superblock.

似乎都不行. 求大佬解答下。

还是只能采用新的两个硬盘组个新的 raid1，把数据同步到这个新的存储池，删掉旧的。