Page Comparison

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1. Check devices installed using 'fdisk -l'
   You can also use 'df -h' to view list of devices in MB/GB's 

   Example

   #Example:
   
   [root@admin]# fdisk -l

    Device   Boot       Start       End           Blocks   Id   System

   /dev/sda1      *               1         20         153600   83   Linux
   /dev/sda2

   20 36990 296960000 83

                      20   36990   296960000   83   Linux
   /dev/sda3

   36990 52287 122880000 83

                36990   52287   122880000   83   Linux
   /dev/sda4

   52287 91202 312579072 5

                52287   91202   312579072     5   Extended
   /dev/sda5

   52288 65036 102400000 83 Linux

                52288   65036   102400000    83  Linux
   /dev/sda6

   65036 66311 10240000 82 Linux

                65036   66311     10240000    82  Linux swap / Solaris
   /dev/sda7

   66311 91202 199936000 83 Linux

                66311   91202   199936000    83  Linux

2. Check to make sure the device you use is properly partitioned for the RAID array you plan on adding it to

3. Check your current RAID configuration using '/proc/mdstat' to ensure you know which RAID array you are targeting

   Example: [root@admin]# cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md1 : active raid1 sdb2[1] sda2[0] 136448 blocks [2/2] [UU] md2 : active raid1 sdb3[1] sda3[0] 129596288 blocks [2/2] [UU] md3 : active raid5 sdl1[9] sdk1[8] sdj1[7] sdi1[6] sdh1[5] sdg1[4] sdf1[3] sde1[2] sdd1[1] sdc1[0] 1318680576 blocks level 5, 1024k chunk, algorithm 2 [10/10] [UUUUUUUUUU] md0 : active raid1 sdb1[1] sda1[0] 16787776 blocks [2/2] [UU] unused devices: <none>

   
   
   

4. Add device to RAID array using 'sudo mdadm --manage /dev/md# --add /dev/sdx#'

   Example: [root@admin]# sudo mdadm --manage /dev/md1 --add /dev/sda3

   
   
   

5. Check status in '/proc/mdstat'

   Example: Personalities : [raid1] [raid6] [raid5] [raid4] md127 : active raid5 sdh1[6] sdg1[4] sdf1[3] sde1[2] sdd1[1] sdc1[0] 1464725760 blocks level 5, 64k chunk, algorithm 2 [6/5] [UUUUU_] [===>.................] recovery = 14.2% (41598211/292945152) finish=125.5min speed=33440K/sec

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