1. check software raid status

# cat /proc/mdstat

Personalities : [raid1] 

md0 : active raid1 sdc1[1] sdb1[2](F)

  346242536 blocks [2/1] [_U]

 

unused devices: <none>



2. remove failed disk from raid

# mdadm --manage /dev/md0 --remove /dev/sdb1 

mdadm: hot removed /dev/sdb1



3. re-add failed disk to raid

# mdadm --manage /dev/md0 --add /dev/sdb1 

mdadm: re-added /dev/sdb1



4. check rebuilding status

# cat /proc/mdstat 

Personalities : [raid1] 

md0 : active raid1 sdb1[2] sdc1[1]

      346242536 blocks [2/1] [_U]

      [>....................]  recovery =  0.0% (13434/346242536) finish=145.6min speed=42192K/sec


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- https://downloads.mariadb.org/mariadb/repositories/#mirror=aarnet_pty_ltd



------------ 14.04 trusty ------------ 

# apt-get install software-properties-common

# apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db

# add-apt-repository 'deb http://mirror.aarnet.edu.au/pub/MariaDB/repo/10.0/ubuntu trusty main'


# apt-get update

# apt-get install mariadb-server mariadb-client

-----------------------------------


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- https://www.virtualbox.org/wiki/Linux_Downloads


단순히 'apt-get update; apt-get install virtualbox' 하면 잡다한 에러가 발생...


1. vi /etc/apt/sources.list

  deb http://download.virtualbox.org/virtualbox/debian trusty contrib



2. add Oracle public key

  wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -



3. apt-get update ; apt-get install dkms ; apt-get install virtualbox-4.3


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