Adding disks to a new local tier
You can create a new local tier (aggregate) using the ThinkSystem Storage Manager for DM Series.
Before you begin
The physical drives must be assigned to a valid node.
The physical drives must not be an existing tier (aggregate).
There must be sufficient compatible spare disks.
About this task
It is a best practice to add disks that are of the same size as the other disks in the tier.
If you add disks that are smaller in size than the other disks in the tier, the tier becomes suboptimal in configuration, which in turn might cause performance issues.
If you add disks that are larger in size than the disks that are available in a pre-existing RAID group within the tier, then the disks are downsized, and their space is reduced to that of the other disks in that RAID group. If a new RAID group is created in the tier and similar sized disks remain in the new RAID group, the disks are not downsized.
If you add disks that are not of the same size as the other disks in the tier, the selected disks might not be added; instead, other disks with a usable size between 90 percent and 105 percent of the specified size are automatically added. For example, for a 744 GB disk, all of the disks in the range of 669 GB through 781 GB are eligible for selection. For all of the spare disks in this range, ONTAP first selects only partitioned disks, then selects only unpartitioned disks, and finally selects both partitioned disks and unpartitioned disks.
You cannot use Storage Manager to add HDDs to the following configurations:
You must use the command-line interface to add HDDs to these configurations.
Shared disks support two RAID types: RAID DP and RAID-TEC.
You cannot use SSDs with storage pool.