> Source: [sk99567](https://support.checkpoint.com/results/sk/sk99567)

# sk99567 - Error while selectively rebuilding RAID array using "mdadm add" command

| Property | Value |
|----------|-------|
| Solution ID | sk99567 |
| Date Created | 2014-04-07 |
| Last Modified | 2022-12-11 |
| Technical Level | Advanced |
| Products | Other |
| Versions | Not Version-Specific |

## Symptoms

- * Error while selectively rebuilding RAID array using 'mdadm add' command.   

  \[root@pod11 admin\]# mdadm -a /dev/md5 /dev/sdb5  
  mdadm: Cannot open /dev/sdb5: Device or resource busy  
  \[root@pod11 admin\]#   

* If the sda or the sdb for a specific md# is in failed state, then an error occurs stating the device or resource is busy while performing the rebuild using 'mdadm add' command.

## Solution

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