Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Uživatelský manuál stáhnout pdf (Strana 15)

Site Recovery Manager Objects relationship

Site Recovery Manager introduces three management objects to handle the various elements of the

configuration. These objects have a hierarchical relationship, as shown in Figure 8.

Figure 8. Site Recovery Manager Object hierarchy

Datastore Groups

At the lowest level, there are LUNs exposed by the EVA that are or will be replicated. In our example, we

have two EVAs with five LUNs presented to the ESX Host. Each LUN houses one VMFS volume or is used as

RDM. The Site Recovery Manager groups these LUNs together into datastore groups which are the smallest

groupings of storage that must be failed over all together. If a VM or a VMFS volume spans multiple LUNs,

the related LUNs are also placed into the same datastore group. It’s important to note that Site Recovery

Manager calculates this for you so you don’t need to figure this out manually.

Protection Group

Each VM that is failed over is associated with a protection group, the next level in the hierarchy. A

protection group is simply the set of VMs that sit on a datastore group that are failed over together.

Datastore groups and protection groups have a 1:1 mapping, but the datastore group is concerned with

storage, and the protection group is all about VMs. It is made up of replicated VMs and various metadata.

Recovery Plan

These previous two levels cover the objects on the protection side, but the key object on the recovery side is

the recovery plan. A recovery plan is the next level in the hierarchy and is a workflow definition that

applies to one or more protection groups and the corresponding instructions for recovering their VMs.

Protection groups can be a part of multiple recovery plans to achieve various level of granularity. In our

example, Recovery Plan A can restart a single protection group (the left most group in Figure 8), while

Recovery Plan B is used to restart everything that is protected.

Recovery plans have three sections: high, medium, and low priority. The VMs in the recovery plan can be

mixed and matched with the recovery sections however you choose. The high priority section starts all of its

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Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Uživatelský manuál Strana 15