Storage plans expand coverage and adjust offset factors

Overview of the changes

Changes

The storage plan coverage for PolarDB Enterprise Edition has been expanded to include:

Level-2 backup usage, with an offset factor of 0.043 for the Chinese mainland and 0.054 for regions outside the Chinese mainland.
Log backup usage, with an offset factor of 0.043 for the Chinese mainland and 0.054 for regions outside the Chinese mainland.
Cold data usage, with an offset factor of 0.045.

For complete offset rules, see Items offset by storage plans below.

Affected regions

The Chinese mainland and regions outside the Chinese mainland.

Effective date

August 17, 2023

Items offset by storage plans

PolarDB storage plans can offset pay-as-you-go storage usage for PolarDB clusters. This includes cluster storage, level-1 backup usage exceeding the free quota, level-2 backup usage, log backup usage, and cold data usage.

Offsetting pay-as-you-gostorage usage for Enterprise Edition

Type	Offset factor	Offset amount (CN)	Offset amount (Intl)
PSL4 (with hot standby enabled)	0.65	1.54 GB	1.54 GB
PSL4 (with hot standby disabled)	0.325	3.08 GB	3.08 GB
PSL5 (with hot standby enabled)	1	1 GB	1 GB
PSL5 (with hot standby disabled)	0.5	2 GB	2 GB

For example, consider a PSL4 cluster with hot standby enabled in the Chinese mainland. If you purchase a 50 GB storage plan, it can offset up to 76.92 GB (50 GB / 0.65) of storage usage. Any usage beyond that amount is billed at the standard pay-as-you-go rate.

Offsetting level-1 backup usage (Enterprise Edition)

Region type	Offset factor	Offset amount
Chinese mainland (PSL4)	0.41	1 / 0.41 = 2.44 GB
Chinese mainland (PSL5)	0.617	1 / 0.617 = 1.62 GB
Regions outside the Chinese mainland (PSL4)	0.41	1 / 0.41 = 2.44 GB
Regions outside the Chinese mainland (PSL5)	0.617	1 / 0.617 = 1.62 GB

For example, assume 50 GB remains in your storage plan after it has offset other usage. If your cluster, located in the Chinese mainland, then uses 50 GB of level-1 backup storage exceeding the free quota, the storage plan automatically uses 30.86 GB (50 GB / 1.62) of its capacity to offset this backup usage, leaving 19.14 GB in the plan.

If the remaining capacity of the storage plan is insufficient to offset the level-1 backup usage, the excess usage is billed at the standard pay-as-you-go rate.

Offsetting level-2 backup usage for Enterprise Edition (New)

Region type	Offset factor	Offset amount
Chinese mainland	0.043	1 / 0.043 = 23.26 GB
Regions outside the Chinese mainland	0.054	1 / 0.054 = 18.52 GB

For example, assume 50 GB remains in your storage plan after offsetting other usage. If your cluster in the Chinese mainland uses 50 GB of level-2 backup storage, the storage plan automatically uses 2.15 GB (50 GB / 23.26) of its capacity to offset this backup usage, leaving 47.85 GB in the plan.

If the remaining capacity of the storage plan is insufficient to offset the level-2 backup usage, the excess usage is billed at the standard pay-as-you-go rate.

Offsetting log backup usage for Enterprise Edition (New)

Region type	Offset factor	Offset amount
Chinese mainland	0.043	1 / 0.043 = 23.26 GB
Regions outside the Chinese mainland	0.054	1 / 0.054 = 18.52 GB

For example, assume 50 GB remains in your storage plan after offsetting other usage. If your cluster in the Chinese mainland uses 50 GB of log backup storage, the storage plan automatically uses 2.15 GB (50 GB / 23.26) of its capacity to offset this backup usage, leaving 47.85 GB in the plan.

If the remaining capacity of the storage plan is insufficient to offset the log backup usage, the excess usage is billed at the standard pay-as-you-go rate.

Offsetting cold data usage for Enterprise Edition (New)

Region type	Offset factor	Offset amount
Chinese mainland	0.045	1 / 0.045 = 22.22 GB
Regions outside the Chinese mainland	0.045	1 / 0.045 = 22.22 GB

For example, assume 50 GB remains in your storage plan after offsetting other usage. If your cluster's cold data uses 50 GB of Object Storage Service (OSS) storage in the Chinese mainland, the storage plan automatically uses 2.25 GB (50 GB / 22.22) of its capacity to offset this usage, leaving 47.75 GB in the plan.

If the remaining capacity of the storage plan is insufficient to offset the OSS usage for cold data, the excess usage is billed at the standard pay-as-you-go rate.

Offset priority

Storage plans are applied to offset your usage in the following order of priority:

PolarDB Enterprise Edition > PolarDB Standard Edition.
For PolarDB Enterprise Edition, the order is: Cluster storage (PSL5 and PSL4) > level-1 backup storage (beyond the free quota) > OSS storage for cold data > level-2 backup storage > log backup storage (beyond the free quota). If multiple clusters have the same priority, the plan is applied first to the cluster with the earliest creation time.