Administrator Guide

Data Progression and Live Volume
46 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
6 Data Progression and Live Volume
Data Progression lifecycles are storage profiles that are managed independently on each SC Series array
configured with Live Volume. If a Live Volume is not replicated to the lowest tier on the destination array, data
ingestion follows the volume-based storage profile. The Data Progression lifecycle on the destination array
then moves data based on the destination storage profile. If a Live Volume is replicated to the lowest tier on
the destination array, data ingestion occurs in the lowest tier of storage. The Data Progression lifecycle on the
destination array then moves data based on the destination storage profile.
6.1 Primary and secondary Live Volume
If a primary Live Volume is located on volume A and is not being replicated to the lowest tier on the
destination volume B, the data will progress down on the destination array to the next tier or RAID level every
12 days. This is because the data on the destination array is never actually being read. All reads take place
on the primary Live Volume array.
For instance, if an array has two tiers of storage and the storage profiles write data at RAID 10 on tier 1,
snapshot data at tier 1 is at RAID 5, and tier 3 is at RAID 5. The blocks of data that were written during the
day will progress from tier 1, RAID 10 to tier 1, RAID 5 on the first night.
If a primary Live Volume is frequently swapped between the Live Volume arrays, then the Data Progression
pattern will be determined by how often the data is accessed on both systems.