VMware VC-SRM4-A - vCenter Site Recovery Manager Manuel d'utilisateur télécharger pdf (Page 9)

Improving VMware Disaster Recovery with EMC RecoverPoint

Figure 5. VMware Raw Device Mapping

Introduced with VMware ESX Server 2.5, Raw Device Mapping allows a special file in

the VMFS volumes to act as a proxy for a raw device. An RDM/P can be thought of as a

symbolic link from a VMFS volume to a raw LUN. The mapping makes LUNs appear as

files in a VMFS volume. The mapping file, not the raw LUN, is referenced in the virtual

machine configuration. When a LUN is opened for access, the mapping file is read to

obtain the reference to the raw LUN. Thereafter, reads and writes go directly to the raw

LUN rather than going through the mapping file.

Using RDM/P in physical mode allows SAN-aware layered applications, such as a

RecoverPoint host splitter, to run inside the virtual machine. If RDM/P is not feasible,

then a SAN-agnostic solution, such as the CLARiiON array-based splitter or a SAN-

aware solution, such as intelligent-fabric splitters from Brocade or Cisco, must be

used.

How to choose the appropriate RecoverPoint splitter

Table 1 summarizes the VMware features and limits for each of the three write-

splitting technologies supported by RecoverPoint.

The simplest configuration is the host-splitter configuration. For this configuration,

the RecoverPoint host splitter is installed on each virtual machine that has data that

needs to be replicated. There are a few limitations on the host driver. First, it only

supports the 32-bit and 64-bit Windows platforms; second, only the virtual machines’

data can be replicated, and it must be attached as a RDM/P volume, and the boot

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VMware VC-SRM4-A - vCenter Site Recovery Manager Manuel d'utilisateur Page 9