What is Symmetrix Device?

Posted by Diwakar

We have discussed regarding Symmetric DMX-3. Lets talk about Symmetrix Device. DMX-3 system applies a high degree of virtualization between what host sees and the actual disk drives. This device has logical volume address that the host can address. Let me clear that “A symmetrix Device is not a physical disk.” Before actually hosts see the symmetrix device, you need to define path means mapping the devices to Front-end director and then you need to set FA-PORT attribute for specific Host. Let not discuss configuration details now. I am trying to explain what Symmetrix device is if this is not physical disk and how it will be created.

You can create up to four mirrors for each Symmetrix device. The Mirror positions are designed M1, M2, M3 and M4. When we create a device and specify its configuration type, the Symmetrix system maps the device to one or more complete disks or part of disks known as Hyper Volumes/Hypers. As a rule, a device maps to at least two mirror means hypers on two different disks, to maintain multiple copies of data.


  1. Anonymous Says:
  2. It's symmetrix , not symmetric

  3. Diwakar Says:
  4. Thanks for pointing it but you can use either one.

  5. Anonymous Says:
  6. Is there really any difference between a Hyper and a volume?

  7. Anonymous Says:
  8. Its quite subjective, when we say Volume, it's a O/S terminology. Here a hyper is least amount of disk being derived from the physical disk

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