Identifying the Function of a Disk Drive

G.2 Identifying the Function of a Disk Drive

The server with the failed disk is configured to support either HDFS or Oracle NoSQL Database, and most disks are dedicated to that purpose. However, two disks are dedicated to the operating system. Before configuring the new disk, find out how the failed disk was configured.

Oracle Big Data Appliance is configured with the operating system on the first two disks.

To confirm that a failed disk supported the operating system:

Check whether the replacement disk corresponds to /dev/sda or /dev/sdb, which are the operating system disks.
```
# lsscsi
```
See the output from Step 11 of "Replacing a Disk Drive".

Verify that /dev/sda and /dev/sdb are the operating system mirrored partitioned disks:

# mdadm -Q –-detail /dev/md2
/dev/md2:
        Version : 0.90
  Creation Time : Mon Jul 22 22:56:19 2013
     Raid Level : raid1
     .
     .
     .
    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2

If the previous steps indicate that the failed disk is an operating system disk, then proceed to "Configuring an Operating System Disk" .