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system. Use Navisphere Manager or Navisphere CLI instead. The only commands that will work are

admsnap flush and admhost flush.

• VMFS volumes are not supported when replicating application data images from a physical (native)

server to an ESX server.

• For ESX 2.5.x, ensure that a CLARiiON snapshot, clone, or mirror of a VMFS volume is not in a

device not ready state (snapshot not activated, session not started, clone not fractured, or secondary

mirror not promoted) when it is assigned to an ESX server.

Since VMFS-3 volumes may contain VM configuration files, swap files, and NVRAM files, these files can be

replicated using CLARiiON replication software.

CLARiiON replication software considerations when using RDM volumes

Please note that:

• You should configure the LUNs to use the physical compatibility mode option when replicating

RDM volumes using CLARiiON replication software. Otherwise, admsnap and admhost will not

work on the virtual machine.

• VMware ESX servers do not write a signature on RDM volumes. Hence, replicas can be presented

back to the same VMware ESX server for use. The copies cannot be used on the source virtual

machines unless the guest OS supports this feature. However, they can be assigned as raw devices to

another virtual machine.

• RDM volumes are supported on the ESX server when replicating application data images from a

physical (native) server to an ESX server.

When replicating OS disks while the virtual machine is powered on, the replica or copy will be in a crash-

consistent state since there is no mechanism available to quiesce a boot image. For application data disks,

native tools available with the application can be deployed to quiesce the application to get a consistent

replica. The array-based consistency technology can be used when applications span multiple LUNs or for

write-order dependent applications such as databases. For automation, scripts may need to be developed to

integrate CLARiiON replication software with the different applications running on the virtual machines.

EMC Replication Manager automates this process by integrating with virtual machine applications,

vCenter/ESX, and CLARiiON replication software.

Using EMC Replication Manager with VMFS and RDM volumes

EMC Replication Manager supports the replication of VMFS and RDM volumes. Replication Manager can

replicate the guest OS and the application data volumes. Following are some things to consider when using

Replication Manager with VMFS and RDM volumes.

Using VMFS volumes

• If the VMFS volume contains multiple virtual disks assigned to one or more VM, the entire VMFS

volume (OS or application data) can be replicated with Replication Manager. Replication Manager

automates the process of presenting the VMFS replica to a secondary ESX server. Then the

VMware administrator must assign the replica to an existing virtual machine or create new virtual

machines.

• If a single virtual disk is configured on an entire VMFS volume and is presented to a VM as an

application data disk, Replication Manager can quiesce, freeze the application and automatically

assign the application’s quiesced data-disk (virtual disk) replica to a secondary ESX server.

Replication Manager also can assign or remove the virtual disk or replica (application data disk)

on an individual virtual machine.

Using RDM volumes

• If using RDM volumes, only application data disk on a VM can be replicated. If replicating a

RDM volume presented as an application data disk to a VM, Replication Manager enables the

application data disk (virtual disk) to be quiesced and automatically assigns the application-

EMC CLARiiON Integration with

VMware ESX Server

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