In this example, the ILM policy is being updated for a three-site StorageGRID system.
After performing an expansion to add the new site, the grid administrator created two new storage pools: a storage pool for Data Center 3 and a storage pool containing all three sites (not the same as the All Storage Nodes default storage pool). Then, the administrator created two new ILM rules and a new proposed ILM policy, which is designed to protect data at all three sites.
When this new ILM policy is activated, objects belonging to Tenant A will be protected by 2+1 erasure coding at three sites, while objects belonging to other tenants (and smaller objects belonging to Tenant A) will be protected across three sites using 3-copy replication.
Rule 1: Three-site erasure coding for Tenant A
| Rule definition | Example value |
|---|---|
| Rule Name | Three-Site Erasure Coding for Tenant A |
| Tenant Account | Tenant A |
| Storage Pool | All 3 Data Centers (includes Data Center 1, Data Center 2, and Data Center 3) |
| Content Placement | 2+1 erasure coding in All 3 Data Centers from day 0 to forever |
Rule 2: Three-site replication for other tenants
| Rule definition | Example value |
|---|---|
| Rule Name | Three-Site Replication for Other Tenants |
| Tenant Account | Ignore |
| Storage Pools | Data Center 1, Data Center 2, and Data Center 3 |
| Content Placement | Three replicated copies from day 0 to forever: one copy at Data Center 1, one copy at Data Center 2, and one copy at Data Center 3. |