Planning Suggestions

This section describes the knowledge related to business group planning.

Planning the Business Group Backup Relationship

After determining cluster members, you can select a backup plan. For example, there are three DCs, each of which has two FWs. Table 1 and Table 2 show the business group planning.

**Table 1** Full backup plan for business groups
DC_1		DC_2		DC_3
Device_A	Device_B	Device_C	Device_D	Device_E	Device_F
Business group plan 1: Define three business groups. Each business group corresponds to a DC. Each business group includes all devices. Devices in a local DC preferentially serve as backup devices. Set five backup devices.
Business group: 1/Priority: 100	Business group: 1/Priority: 90	Business group: 1/Priority: 80	Business group: 1/Priority: 70	Business group: 1/Priority: 60	Business group: 1/Priority: 50
Business group: 2/Priority: 60	Business group: 2/Priority: 50	Business group: 2/Priority: 100	Business group: 2/Priority: 90	Business group: 2/Priority: 80	Business group: 2/Priority: 70
Business group: 3/Priority: 80	Business group: 3/Priority: 70	Business group: 3/Priority: 60	Business group: 3/Priority: 50	Business group: 3/Priority: 100	Business group: 3/Priority: 90

The feature of this plan is that all devices join business groups. A large amount of data needs to be backed up, greatly consuming performance. The advantage is high availability. For a single DC, services are interrupted only if all devices fail. Plan 2 balances between performance and availability, as shown in Table 2.

**Table 2** Partial backup plan for business groups
DC_1		DC_2		DC_3
Device_A	Device_B	Device_C	Device_D	Device_E	Device_F
Business group plan 2: Define three business groups. Each business group corresponds to a DC. The services of each business group are dispersedly and evenly backed up to other DCs. Devices in a local DC preferentially serve as backup devices. Set three backup devices.
Business group: 1/Priority: 100	Business group: 1/Priority: 90	Business group: 1/Priority: 70	-	-	Business group: 1/Priority: 80
-	Business group: 2/Priority: 80	Business group: 2/Priority: 100	Business group: 2/Priority: 90	Business group: 2/Priority: 70	-
Business group: 3/Priority: 70	-	-	Business group: 3/Priority: 80	Business group: 3/Priority: 100	Business group: 3/Priority: 90

Table 3 shows comparison of the two backup plans.

**Table 3** Backup plan comparison
Item	Full Backup	Partial Backup
Amount of backup data	Large. High backup bandwidth is required.	Medium
Availability	High. Services are interrupted only if all devices fail.	Medium
VM migration scenario	Fully matched. No matter which DC a VM is migrated, it can match backup entries.	Partially matched. Ensure that devices in the DC to which a VM may be migrated have backup entries. Otherwise, services will be interrupted for a short period.
Performance	Low. Full backup greatly consumes resources.	High