You can follow the below mentioned steps from Configuration guide (http://www.vmware.com/pdf/vi3_35/esx_3/r35u2/vi3_35_25_u2_3_server_config.pdf) to extend the VMFS datastore . However, its not mandatory that you have to keep console vmdk in existing vmfs datastore.
I would suggest, instead of extending the partition, create a new VMFS volume with 9+GB disk sapce and select the newly created partiotion as the destination for cos vmdk.
To add one or more extents to the datastore
1 Log in to the VI Client and select a server from the inventory panel.
2 Click the Configuration tab and click Storage.
3 Select the datastore to expand and click Properties.
4 In the Extents panel, click Add Extent.
5 Select the disk to add as the new extent and click Next.
6 Review the current layout of the disk you are using for the extent to make sure the
disk doesn’t contain any important information.
7 Set the capacity for the extent.
By default, the entire free space available on the storage device is offered to you.
8 Click Next.
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CAUTION If a disk or partition you add was formatted previously, it will be
reformatted and lose the file systems and any data it contains.
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9 Review the proposed extent layout and the new configuration of your datastore,
and click Finish.
10 Perform a rescan on all servers that see the datastore.
:+: VCP3, VCP4, RHCE, EMCPA.
