When you add partitioned disks to a local tier (aggregate), you must leave a disk with both the root and data partition available as a spare for every node. If you do not and your node experiences a disruption, ONTAP cannot dump the core to the spare data partition.

Before you begin

You must have both a spare data partition and a spare root partition on the same type of disk owned by the same node.

Steps

Using the CLI, display the spare partitions for the node:

storage aggregate show-spare-disks -original-owner node_name

Note which disk has a spare data partition (spare_data) and which disk has a spare root partition (spare_root). The spare partition will show a non-zero value under the Local Data Usable or Local Root Usable column.
Replace the disk with a spare data partition with the disk with the spare root partition:

storage disk replace -disk spare_data -replacement spare_root -action start

You can copy the data in either direction; however, copying the root partition takes less time to complete.
Monitor the progress of the disk replacement:

storage aggregate show-status -aggregate aggr_name
After the replacement operation is complete, display the spares again to confirm that you have a full spare disk:

storage aggregate show-spare-disks -original-owner node_name

You should see a spare disk with usable space under both “Local Data Usable” and Local Root Usable.

Example

You display your spare partitions for node c1-01 and see that your spare partitions are not aligned:

c1::> storage aggregate show-spare-disks -original-owner c1-01

Original Owner: c1-01
 Pool0
  Shared HDD Spares
                              Local    Local
                               Data     Root  Physical
 Disk    Type   RPM Checksum Usable   Usable      Size
 ------- ----- ---- -------- ------- ------- --------
 1.0.1   BSAS  7200 block    753.8GB     0B   828.0GB
 1.0.10  BSAS  7200 block         0B 73.89GB  828.0GB

You start the disk replacement job:

c1::> storage disk replace -disk 1.0.1 -replacement 1.0.10 -action start

While you are waiting for the replacement operation to finish, you display the progress of the operation:

c1::> storage aggregate show-status -aggregate aggr0_1

Owner Node: c1-01
 Aggregate: aggr0_1 (online, raid_dp) (block checksums)
  Plex: /aggr0_1/plex0 (online, normal, active, pool0)
   RAID Group /aggr0_1/plex0/rg0 (normal, block checksums)
                                    Usable Physical
 Position Disk    Pool Type   RPM     Size     Size Status
 -------- ------- ---- ---- ----- -------- -------- ----------
 shared   1.0.1    0   BSAS  7200  73.89GB  828.0GB (replacing,copy in progress)
 shared   1.0.10   0   BSAS  7200  73.89GB  828.0GB (copy 63% completed)
 shared   1.0.0    0   BSAS  7200  73.89GB  828.0GB (normal)
 shared   1.0.11   0   BSAS  7200  73.89GB  828.0GB (normal)
 shared   1.0.6    0   BSAS  7200  73.89GB  828.0GB (normal)
 shared   1.0.5    0   BSAS  7200  73.89GB  828.0GB (normal)

After the replacement operation is complete, confirm that you have a full spare disk:

ie2220::> storage aggregate show-spare-disks -original-owner c1-01

Original Owner: c1-01
 Pool0
  Shared HDD Spares
                             Local    Local
                              Data     Root  Physical
 Disk   Type   RPM Checksum Usable   Usable      Size
 ------ ----- ---- -------- -------- ------- --------
 1.0.1  BSAS  7200 block    753.8GB  73.89GB  828.0GB