How to resize RAID1 array with mdadm

I've running Ubuntu 11.04 (kernel 2.6.38-11). I replaced 2x160GB with 2x500GB drives. They are configured as RAID1.

The partition tables show the right sizes. Here's sfdisk:

# sfdisk -d /dev/sdb
# partition table of /dev/sdb
unit: sectors

/dev/sdb1 : start=       63, size=   192717, Id=fd, bootable
/dev/sdb2 : start=   192780, size=  7807590, Id=fd
/dev/sdb3 : start=  8000370, size=968767695, Id=fd
/dev/sdb4 : start=        0, size=        0, Id= 0

And fdisk:

# fdisk -l /dev/sdb

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006c78f

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          12       96358+  fd  Linux raid autodetect
/dev/sdb2              13         498     3903795   fd  Linux raid autodetect
/dev/sdb3             499       60801   484383847+  fd  Linux raid autodetect

But I'm not seeing the new space:

root@green:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md2              143G  134G  8.3G  95% /


root@green:~# mdadm --examine /dev/sdb3
/dev/sdb3:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : b8f83980:f60d820c:74c46fbf:0baa68bc
  Creation Time : Sun Mar 29 18:48:46 2009
     Raid Level : raid1
  Used Dev Size : 152247936 (145.19 GiB 155.90 GB)
     Array Size : 152247936 (145.19 GiB 155.90 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 2

    Update Time : Mon Oct 10 19:22:36 2011
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 7b5debb7 - correct
         Events : 10729526


      Number   Major   Minor   RaidDevice State
this     0       8       19        0      active sync   /dev/sdb3
   0     0       8       19        0      active sync   /dev/sdb3
   1     1       8        3        1      active sync   /dev/sda3

I tried mdadm and resize2fs:

# mdadm --grow /dev/md2 --size=max
mdadm: component size of /dev/md2 has been set to 152247936K

# resize2fs /dev/md2 
resize2fs 1.41.14 (22-Dec-2010)
The filesystem is already 38061984 blocks long.  Nothing to do!

Any ideas?

Added per request

# cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md2 : active raid1 sdb3[0] sda3[1]
      152247936 blocks [2/2] [UU]

md0 : active raid1 sdb1[0] sda1[1]
      96256 blocks [2/2] [UU]

md1 : active raid1 sdb2[0] sda2[1]
      3903680 blocks [2/2] [UU]

unused devices: <none>

partitions

# cat /proc/partitions 
major minor  #blocks  name

   8        0  488386584 sda
   8        1      96358 sda1
   8        2    3903795 sda2
   8        3  152248005 sda3
   8       16  488386584 sdb
   8       17      96358 sdb1
   8       18    3903795 sdb2
   8       19  152248005 sdb3
   9        1    3903680 md1
   9        0      96256 md0
   9        2  152247936 md2

parted:

# parted
GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print all                                                        
Model: ATA WDC WD5000AAKX-0 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      32.3kB  98.7MB  98.7MB  primary  ext3            boot, raid
 2      98.7MB  4096MB  3997MB  primary  linux-swap(v1)  raid
 3      4096MB  500GB   496GB   primary  ext3            raid


Model: ATA WDC WD5000AAKS-4 (scsi)
Disk /dev/sdb: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      32.3kB  98.7MB  98.7MB  primary  ext3            boot, raid
 2      98.7MB  4096MB  3997MB  primary  linux-swap(v1)  raid
 3      4096MB  500GB   496GB   primary  ext3            raid


Model: Linux Software RAID Array (md)
Disk /dev/md1: 3997MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End     Size    File system     Flags
 1      0.00B  3997MB  3997MB  linux-swap(v1)


Model: Linux Software RAID Array (md)
Disk /dev/md0: 98.6MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End     Size    File system  Flags
 1      0.00B  98.6MB  98.6MB  ext3


Model: Linux Software RAID Array (md)
Disk /dev/md2: 156GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End    Size   File system  Flags
 1      0.00B  156GB  156GB  ext3

Comment via email:

the problem is in metadata, you just need to assemble raid array with
parameter –update devicesize

and after that -G /dev/md? -z max will done job 🙂