Sustainable Generation Manager (SGM) Phase-I

Sustainable Generation Manager (SGM) is a technology developed to ensure that data stored on Xenea lasts perpetually, preventing data loss over the lifetime of the storage device and other risks. SGM also eliminates the excessive decentralization of data, avoiding the increase in data volume caused by unnecessary encrypted and decentralized data.

DACS alone cannot guarantee the sustainability of each storage device to store data permanently for 100 or 200 years on its own. Therefore, it must be maintained at the system level.

SGM keeps and references the timestamp of each storage, then replicates the data or NFT with its contents to other DACS nodes. The default storage expiration date is every 180 days from the end of the day on which the data was stored. When the storage lifetime expires, the DACS node is replicated and restored to a new DACS node.

The 1st generation node then expires and all the data on it is deleted. After the deletion, the node may be reused as storage space for new content; SGM replicates the data of the 1st generation DACS node to the free space of the 2nd generation. Once the replication is complete, the 1st generation storage space is freed up as storage space for new content.

SGM Parameters

First, data is stored on the storage node, then the date of the last updated storage is stored on the mainnet; if more than 180 days have passed, SGM searches for a new storage node at the closest network distance (number of node hops), and selects the target storage node. The target node will store the data of the storage node that is over 180 days old with a P2P connection. The main parameters include:

1. Last modified date of the storage node

2. Timestamp measurement of each storage node's update date and time

3. Search for new storage node candidates by nearest pops

4. Data replication by copy command.

The table below shows the list of conditional parameters:

Function	Parameters
Date of the last update of the storage node.	Year	Month	Date
Measure of each storage node date with timestamp.	Year	Month	Date
Search the new candidate of the new storage node by nearest pops.	1 hop	2 hops	3 hops
Duplication date parameters are set from 1 day to 365 days.	1 day	1 week	1 month	3 months	6 months	12 months

Figure 4 shows the data replication process flow chart of SGM: SGM agent continuously observes all storage nodes and selects the next candidate storage node for the new region of NFT data.

Old storage after 180 days (default value) moves its data to the new storage and will be used for new data. Storage that has lost capacity due to physical damage can also be utilized on a per-size basis.

Thus, eventually, these older storages can also be maintained as active nodes, with the storage node owners keeping their mining rewards for the storage space held by the DACS node.