Overview of volume shredder – HP XP Data Shredder Software User Manual
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1.
Zero-format the external mainframe volumes.
The term zero-formatting refers to a formatting operation that writes the number 0 (zero) to
the entire disk areas. For information on how to zero-format volumes, see the documentation
for the mainframe system or the external storage system that you are using.
2.
Use XP External Storage to perform mapping of zero-formatted external volumes and register
the volumes in an external volume group. For detailed instructions on how to do this, see the
HP StorageWorks XP24000/XP20000 External Storage Software User Guide.
CAUTION:
Ensure that the external volume group does not include volumes that are not
zero-formatted. If an external volume group includes volumes that are not zero-formatted, the
volumes will be blocked when you perform the operation described in the next step and,
therefore, hosts will be unable to read from or write to the volumes. If you have not
zero-formatted external volumes, but you want to make the external volumes usable with the
storage system, you must use the Format command of Virtual LVI.
3.
Use Virtual LVI to specify the external volume group, and then overwrite control blocks in the
volumes in the specified external volume groups. After the overwriting process finishes, the
external volumes will be usable with the storage system. For detailed information on how to
overwrite control blocks, see
“Making External Mainframe Volumes Usable” (page 87)
.
Control blocks are a type of area in a volume and contain information other than user data.
Information required for managing a volume is recorded in the control blocks.
Overview of Volume Shredder
Volume Shredder is the software that can delete data in volumes and prevent the deleted data
from being restored.
When the user of a volume is changed, the data stored by the previous user should be deleted for
security reasons. Volume Shredder is based on DoD5220.22-M (the standard defined by the U.S.
Department of Defense); therefore, it can delete all data in the volume completely. In this manual,
the function provided by Volume Shredder is called the shredding function.
The shredding function completely deletes data in the specified volume by repeatedly overwriting
the data with dummy data. This function can be executed from HP StorageWorks Remote Web
Console computers. An example of executing the shredding function from a Remote Web Console
computer is shown in
When you execute the shredding function, all user data in a volume is overwritten by dummy data,
and the user data will be deleted. However, because of the nature of hard disks, one overwrite is
not enough to delete the user data completely, and the deleted user data could be restored.
Therefore, HP recommends that you overwrite a volume at least three times using dummy data.
The default setting of Volume Shredder defines three times of overwriting using dummy data. If you
change the setting, you can overwrite the volume up to eight times. For details on the setting of
Volume Shredder, see
“Defining the Shredding Settings” (page 89)
.
You can use the shredding function regardless of the kinds of volumes (for example, VDEV, LDEV,
or CV) and the emulation types, but the status of the volumes must be Blocked. If the status of a
volume is Normal, the volume cannot be the target of the shredding function in the Customized
Volume window. For details on how to change the status of the volume to Blocked, see
to Use Volume Shredder” (page 23)
.
You cannot perform shredding on the following volumes:
•
Pool volumes (pool-VOLs)
•
HP StorageWorks XP Snapshot Software virtual volumes (V-VOLs)
•
Journal volumes
Overview of Volume Shredder
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