HPP Enterprises P4000 SAN - Manual (Page 62)

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initial deployment of SmartClone volumes takes no additional footprint on the SAN, these volumes are
fully writeable and may ultimately be completely re-written to occupy an entire volume’s worth of
space. Functions such as defragmentation at the file system level may count as additional new writes
to the SAN as some operating systems prefer to write new blocks over claiming original blocks.
Therefore, it is considered best practice to defragment before a SmartClone is performed. SmartClone
volumes should disable defragmentation operations as this may lead to volumes filling out their thin
provision.