Linux is cool :-)

Another example why I think Linux is cool.
My discs (a raid-1 set, aka mirroring) was getting full. I added a bigger drive, marked one of the mirror discs as faulty and Linux auto-added the new drive. I did the same trick with another new drive. Next I removed the old drives.

Now I had 2 new drives in a raid-1 set with large partitions but the same old filesystem. First lets resize the raid array….

root@inzicht:~# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Wed Jun 27 12:10:49 2007
     Raid Level : raid1
     Array Size : 309524288 (295.19 GiB 316.95 GB)
  Used Dev Size : 309524288 (295.19 GiB 316.95 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Tue Sep  6 13:43:14 2011
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : b664fe5b:f5c02869:e0e19a8a:9e985100
         Events : 0.11364584

    Number   Major   Minor   RaidDevice State
       0       8       19        0      active sync   /dev/sdb3
       1       8        3        1      active sync   /dev/sda3
root@inzicht:~# mdadm --grow /dev/md0 --size=max
root@inzicht:~# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Wed Jun 27 12:10:49 2007
     Raid Level : raid1
     Array Size : 973595136 (928.49 GiB 996.96 GB)
  Used Dev Size : 973595136 (928.49 GiB 996.96 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Tue Sep  6 13:43:23 2011
          State : active, resyncing
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

 Rebuild Status : 31% complete

           UUID : b664fe5b:f5c02869:e0e19a8a:9e985100
         Events : 0.11364586

    Number   Major   Minor   RaidDevice State
       0       8       19        0      active sync   /dev/sdb3
       1       8        3        1      active sync   /dev/sda3
root@inzicht:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb3[0] sda3[1]
      973595136 blocks [2/2] [UU]
      [======>..............]  resync = 31.8% (309651456/973595136) finish=2175.1min speed=5086K/sec

unused devices: <none>
root@inzicht:~# xfs_growfs /
meta-data=/dev/md0               isize=256    agcount=16, agsize=4836317 blks
         =                       sectsz=512   attr=0
data     =                       bsize=4096   blocks=77381072, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=32768, version=1
         =                       sectsz=512   sunit=0 blks, lazy-count=0
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 77381072 to 243398784
root@inzicht:~#

Now what other non-unix os can beat this?

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