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VMware ESX 2.x to ensure the ESX service console and VMkernel see the additional space. Since the

LUN is presented to the virtual machine, expansion must take place at the virtual machine level. Use the

native tools available on the virtual machine to perform the file system expansion at the virtual machine

level.

CLARiiON LUN migration conducted on VMFS or RDM volumes is transparent to the guest OS. For

RDM volumes, if the destination LUN is larger than the source LUN after the migration process completes,

use the procedure previously outlined to rescan the HBAs, and then expand the disk at the virtual machine

level. Note that RDM volumes must use the physical compatibility mode for expansion when using the

CLARiiON metaLUN technology.

Expanding and migrating LUNs used as VMFS volumes

VMware ESX supports the volume management functions where VMFS volumes can be concatenated

together as a single volume. This procedure is also called VMFS spanning in ESX 2.x and is done at the

ESX Server level. VMware ESX 4.0/3.x/ESXi also provide volume management functionality for VMFS

volumes through a process called Adding Extents with ESX 3.x or the “Increase” function in ESX 4 within

VMware vCenter. The difference between VMFS-2 spanning within ESX 2.x and volume management

using VMFS-3 within VMware ESX 3.x/ESXi is:

• Unlike VMFS-2, a VMFS-3 volume can be extended while in use.

• With VMFS-2, loss of any partition renders the whole volume inaccessible. For VMFS-3, except for

the head partition, loss of a partition renders only the data on that partition inaccessible.

The first option to expand a CLARiiON LUN configured as a VMFS-2 or VMFS-3 volume is to add a new

CLARiiON LUN and concatenate the two LUNs using the VMFS spanning process in ESX 2.x, or by

adding extents in VMware ESX 3.x/ESXi or by using the “Increase” function in ESX 4.0. To expand the

virtual disk presented to the virtual machine, use the vmkfstools utility available on ESX Server.

The other option is to expand a VMFS-3 volume using CLARiiON metaLUNs and span, add an extent, or

increase the size of the VMFS datastore using the additional space in the original VMFS volume available

before expansion. Steps required to expand a VMFS datastore in ESX 4.0 are as follows:

1) Expand the CLARiiON LUN on the CLARiiON storage system to the desired LUN size.

2) Issue a rescan at the ESX level.

3) Select the Properties tab of the datastore and select the Increase option as shown in

Figure 17.

4) After selecting the increased original CLARiiON LUN through the “Increase” wizard, the VMFS

datastore size automatically increases as needed.

5) With ESX 4.0, the VMFS datastore size can be increased to almost a 2 TB limit while the virtual

machines are powered on while the “Increase” wizard is executed. This is not true for ESX

3.x/ESX3i since the virtual machines must be powered off before increasing the size of the VMFS

datastore.

EMC CLARiiON Integration with

VMware ESX Server

Applied Technology 28

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