Improving VMware Disaster Recovery with EMC RecoverPoint
Write-splitting technologies
Array-based write splitting
RecoverPoint supports array-based write splitting on Symmetrix VMAXe, VNX series
and CLARiiON CX3 and CX4 arrays. The array-based write splitter is included with the
Symmetrix VMAXe and the VNX while the CLARiiON write splitter is a feature of
CLARiiON FLARE
®
26, 28, 29, and 30. The array-based write splitter is supported on
the Symmetrix VMAXe series, VNX series and CLARiiON CX3 and CX4 arrays as well as
for block volumes available on Celerra
®
unified arrays, including the NS20, NS40,
NS80, NS-120, NS-480, and NS-960 models. The write-splitting function operates in
each storage processor where it monitors writes to protected volumes and ensures
that the RecoverPoint appliance receives a copy of the write. Up to four RecoverPoint
clusters can be attached to the same VMAXe series, VNX series or CLARiiON array. A
benefit of this is that multiple production sites can use the same array such as might
exist in a shared disaster recovery site or at a service provider’s site.
SAN
OPTIONAL DISASTER RECOVERY SITE PRODUCTION SITE
Prod
LUNs
Fibre
Channel/WAN
Local
copy
Application
servers
SAN
RecoverPoint
appliance
RecoverPoint bi-directional
replication/recovery
Remote
copy
Standby
servers
RecoverPoint
appliance
Production and
local journals
Remote
journal
Storage
arrays
Storage
arrays
Symmetrix VMAXe, VNX-, and
CLARiiON-based write splitter
VMware ESX Server VMware ESX Server
Figure 2. Array splitter architecture
For VMware virtual machines, this enables replication of VMFS 3 and VMFS 5 and
physical RDM/P (RDM/P) volumes without the cost or complexity of an intelligent
fabric implementation. The splitter supports Fibre Channel (FC) volumes for all arrays
as well as iSCSI volumes presented by the VNX or CLARiiON array to any host,
including to an ESX server.
Host-based write splitting
For VMware, RecoverPoint provides a host-based write splitter (also called a KDriver)
for Windows Server platforms. The KDriver is installed on each Windows virtual
machine where it operates above any multipath driver, but below the file system and
volume management layers. The KDriver monitors writes and ensures that a copy of
all writes to a protected volume is sent to the RecoverPoint appliance. Since the
KDriver runs in the virtual machine, the only volumes that can be replicated by
RecoverPoint would be SAN volumes attached to the virtual machine in RDM/P mode.
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