The storage capacity of a storage pool can be expanded by creating a new RAID group and then adding it to the pool. This operation can be performed while the pool is online and accessible to users. QTS writes data linearly to storage pools containing multiple RAID groups. This means that QTS writes data to a RAID group until a group is full before writing data to the next RAID group.
If a storage pool contains multiple RAID groups and one RAID group fails, all data in the storage pool will be lost. Ensure that you have a complete data backup plan.
To expand a RAID 50 or RAID 60 pool, you must create a new RAID 50 or 60 group with the same number of disks and sub-groups as the original pool. It is not possible to add additional sub-groups.
QTS creates the new RAID group and then starts rebuilding the storage pool. The capacity of the pool increases after RAID rebuilding is finished.