HP Storage Mirroring Software - Manual (Page 194)

Workload protection Page 193 of 677
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
performance impacts for the users after failover.
Network adapters
You must map at least one NIC from the source to one NIC on the target. If
the source has more NICs than the target, some of the source NICs will
not be mapped to the target. Therefore, the IP addresses associated with
those NICs will not be available after failover, unless you configure the
advanced options. If there are more NICs on the target than the source, the
additional NICs will still be available after failover.
File system format
The source and the target must have the same file system format. For
example, an NTFS volume cannot be sent to a FAT volume.
HAL type and version
The Windows hardware abstraction layer (HAL) refers to a layer of
software that deals directly with your computer hardware. The HAL type
and version do not have to be identical, but they must be compatible
between the source and the target. If the two are incompatible, Storage
Mirroring Recover will warn you. In that case, you must upgrade or
downgrade the target.
Administrative shares
The Full-Server Failover Manager console must be able to access
administrative shares on the source and the target.
System volume
The target must have the same system volume as the source. The system
volume is the disk volume that contains the hardware-specific files that are
needed to start Windows. The system volume might be the same volume
as the boot volume, but that configuration is not required.
Logical volumes
There are no limits to the number of logical volumes, although you are
bound by operating system limits. The source and the target must have the
same number of logical volumes, and the source and the target must have
the same drive letters. For example, if the source has drives C: and D:, the
target cannot have drives D: and E:. In this case, the target must also have
drives C: and D:.