Data Relocation on Existing Linux Devices

When you add an ES GuardPoint to a device that has been initialized with the xform option, CTE first relocates existing data in the region of the device designated as CTE Private Region. The data is relocated to the end of the LUN, into the new space allocated. The relocation occurs once when the device is guarded for the first time.

Relocation of data is transparent to applications accessing data through the ES GuardPoint. CTE will map application I/O requests over the CTE Private Region to the relocated region. After guarding the device, you can grow the device size further if necessary. However, you cannot shrink the device size.