Tag Archives: Clariion CX4

Protocol considerations with VMware

A good video I came across from EMC discussing some storage protocol considerations when looking at VMware.

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EMC Clariion CX4 Virtual Provisioning

The EMC Clariion CX4  is a very flexible box. One of the ways which it enables admins to get the most bang for their buck is by utilising Virtual (Thin) provisioning. This effectivelly enables an admin to create a pool of storage from which smaller volumes of storage (thin LUNs) are provisioned. See below: 

  

(Click Image to enlarge) 

Many people will see thin provisioning as the answer to all their problems in terms of storage management.. No. It still needs to be monitored, managed and some intelligent thinking still needs to go into what volumes will be thin provisioned. The EMC Clariion CX4 also has some limitations around thin provisioning.  

Each model of Clariion has a limit as to how many drives may be contained in a pool of storage for virtual provisioning, so If you’re thinking of positioning a CX4-120 with one big pool of disks (ie 30 disks) for thin provisioning, think again.. please see below : 

   

Also please bear in mind, that although a disk pool for thin provisioning may contain more drives than RAID allows, the maximum size of a single LUN may not exceed 14TB.