HP XP7 Storage - Manual (Page 4)

1 Overview of Volume Shredder
This
chapter provides an overview of Volume Shredder operations on the HP XP7 Storage
system.
Data security practices and Volume Shredder
The
Volume Shredder software on Remote Web Console enables you to securely erase data on
volumes
in the HP XP7 by overwriting existing data to prevent restoration of the erased data. For
example,
when the user of a volume changes, you may want to purge the data stored by the
previous
user before giving access to the new user. This method of erasing data by overwriting it
with
dummy data is referred to as shredding.
Because of the way data is written on the drives, overwriting data once or twice might not be
enough to ensure that the data cannot be restored. The best practice is to overwrite data at least
three times with dummy data. Volume Shredder allows you to specify the number of times the data
is overwritten, enabling you to ensure compliance with applicable requirements (for example,
DoD5220.22-M).
Supported volume types
You can use Volume Shredder to shred both open-systems and mainframe systems, including logical
devices (LDEVs) and custom volumes (CVs) of all emulation types. External volumes and Thin
Provisioning virtual volumes* can also be shredded.
*When a shredding operation is performed on an unused virtual volume for Thin Provisioning, no
dummy data is written to the volume.
You cannot use Volume Shredder to shred the following types of volumes:
•
Pool volumes
•
Virtual volumes for Fast Snap
•
Journal volumes
•
Volumes that are not write-enabled (access attribute is not read/write)
•
TSE-VOL
Volume Shredder operations
The following figure shows user data that is being overwritten three times (default value for number
of overwrites). Volume Shredder overwrites data using the following dummy data values:
•
The first overwrite is 00.
•
The second overwrite is FF.
•
The third overwrite is 00.
4 Overview of Volume Shredder