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operating file system initializes all blocks, the virtual disk will need all the space to be allocated up front.

Note that when the first write is triggered on a zeroedthick virtual disk, it will write zeroes on the region

defined by the VMFS block size and not just the block that was written to by the application. This behavior

will impact performance of array-based replication software since more data needs to be copied based on

the VMFS block size than needed. If the thick option is used (as shown in the table) when using array-

based replication software, only the block that it is written to is consumed. However there is a possibility

that stale data might be returned to the user if the blocks are reused.

In ESX 4.0, a virtually provisioned CLARiiON LUN can be configured as zeroedthick or thin. When using

the thin virtual disk format, the VMFS datastore is aware of the space consumed by the virtual machine, as

shown in

Figure 19. When using the virtual disk thin option, the VMware admin needs to monitor the

VMFS datastore consumed capacity; vSphere provides a simple alert when datastore thresholds are

reached.

Figure 19. View VMFS datastore and CLARiiON LUN consumption when using the virtual

disk “thin” format

In addition, with ESX 4.0, when using the vCenter features like Cloning, Storage VMotion, Cold

Migration, and Deploying a template, the zeroedthick or thin format remains intact on the destination

datastore. In other words, the consumed capacity of the source virtual disk is preserved on the destination

virtual disk and not fully allocated. This is not the case with ESX 3.x/ESXi where the zeroedthick or thick

format is changed to eagerzeroedthick format when operations like Cloning, Storage VMotion, and others

are performed on the source virtual disk resulting in a fully allocated destination virtual disk.

Using CLARiiON replication software with VMware ESX

4.0/3.x/ESX ESXi and 2.5.x

CLARiiON replication software products including SnapView, MirrorView, and SAN Copy are supported

with VMware ESX Server using both VMFS and RDM volumes. The OS image and the application/data

can be replicated using CLARiiON replication software. The following considerations apply to iSCSI and

EMC CLARiiON Integration with

VMware ESX Server

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