HP Storage Mirroring Software - Manual (Page 124)

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Full-server protection
Before you can protect your entire source, you need to select a target that is suitable to
become the source, in the event of a source failure. Storage Mirroring Recover will
validate the target you select and identify any incompatibilities. Errors will disqualify the
target as a suitable server. First you will need to
find a compatible target , then you can
establish full-server protection .
Finding a compatible target
Review the table below to determine if your server is a compatible target.
Requirement Configuration
Operating
system
version
The source and the target must have the same operating system. For
example, you cannot have Windows 2003 on the source and Windows
2008 on the target. The two servers do not have to have the same
level of service pack or hotfix.
Domain
The domain of the source should be the same as the domain of the
target.
Server role
The target cannot be a domain controller. Ideally, the target should not
host any functionality (file server, application server, and so on)
because the functionality will be removed when failover occurs.
If your source is a domain controller, it will start in a non-authoritative
restore mode after failover. This means that if the source was
communicating with other domain controllers before failover, it will
require one of those domain controllers to be reachable after failover
so it can request updates. If this communication is not available, the
domain controller will not function after failover. If the source is the only
domain controller, this is not an issue.
Architecture
The source and the target must have the same architecture. For
example, you cannot failover a 32-bit server to a 64-bit server.
Processors
There are no limits on the number or speed of the processors, but the
source and the target should have at least the same number of
processors. If the target has fewer processors or slower speeds than
the source, there will be performance impacts for the users after
failover.
Memory
The target memory should be within 25% (plus or minus) of the source.
If the target has much less memory than the source, there will be